Add visualization tool for topology cli

[azreenz]

Add visualization tool for topology cli to create ASCII art to visualize block and tree slurm topologies

• Add --generate_visualization option (may want to change how this is named)
• Add --visual_block_size option to determine what each block is supposed to look like (default as 18 to mimic a rack)
• Add visualize function to Topology class
• run function now returns the topology string so visualize function can take it in to generate the visualization
• If nodes are less than max_block_size then we fill out with 'X'
• Commented out blocks are still visualized but include a "** This block is ineligible for scheduling because # of nodes < min block size**" line in the header
• Add test cases to validate new function

Example Block topology visual:

block 1  : # of Nodes = 18
ClusterUUID + CliqueID : 5e797fc6-0f46-421a-8724-0e102c0f723c
|-----------------|-----------------|-----------------|
| hpcbench-hpc-1  | hpcbench-hpc-5  | hpcbench-hpc-9  |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-13 | hpcbench-hpc-17 | hpcbench-hpc-21 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-25 | hpcbench-hpc-29 | hpcbench-hpc-33 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-37 | hpcbench-hpc-41 | hpcbench-hpc-45 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-49 | hpcbench-hpc-53 | hpcbench-hpc-57 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-61 | hpcbench-hpc-65 | hpcbench-hpc-69 |
|-----------------|-----------------|-----------------|

block 2  : # of Nodes = 18
ClusterUUID + CliqueID : 5e797fc6-0f46-421a-8724-0e102c0f721e
|-----------------|-----------------|-----------------|
| hpcbench-hpc-2  | hpcbench-hpc-6  | hpcbench-hpc-10 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-14 | hpcbench-hpc-18 | hpcbench-hpc-22 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-26 | hpcbench-hpc-30 | hpcbench-hpc-34 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-38 | hpcbench-hpc-42 | hpcbench-hpc-46 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-50 | hpcbench-hpc-54 | hpcbench-hpc-58 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-62 | hpcbench-hpc-66 | hpcbench-hpc-70 |
|-----------------|-----------------|-----------------|

block 3  : # of Nodes = 18
ClusterUUID + CliqueID : 5e797fc6-0f46-421a-8724-0e102c0f724b
|-----------------|-----------------|-----------------|
| hpcbench-hpc-3  | hpcbench-hpc-7  | hpcbench-hpc-11 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-15 | hpcbench-hpc-19 | hpcbench-hpc-23 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-27 | hpcbench-hpc-31 | hpcbench-hpc-35 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-39 | hpcbench-hpc-43 | hpcbench-hpc-47 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-51 | hpcbench-hpc-55 | hpcbench-hpc-59 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-63 | hpcbench-hpc-67 | hpcbench-hpc-71 |
|-----------------|-----------------|-----------------|

block 4  : # of Nodes = 18
ClusterUUID + CliqueID : 5e797fc6-0f46-421a-8724-0e102c0f722a
|-----------------|-----------------|-----------------|
| hpcbench-hpc-4  | hpcbench-hpc-8  | hpcbench-hpc-12 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-16 | hpcbench-hpc-20 | hpcbench-hpc-24 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-28 | hpcbench-hpc-32 | hpcbench-hpc-36 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-40 | hpcbench-hpc-44 | hpcbench-hpc-48 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-52 | hpcbench-hpc-56 | hpcbench-hpc-60 |
|-----------------|-----------------|-----------------|
| hpcbench-hpc-64 | hpcbench-hpc-68 | hpcbench-hpc-72 |
|-----------------|-----------------|-----------------|

Example Block topology visualization with nodes less than max_block_size

block 1  : # of Nodes = 6
ClusterUUID + CliqueID : N/A N/A
|---------------|---------------|---------------|
| vis0603-gpu-2 | vis0603-gpu-5 | vis0603-gpu-1 |
|---------------|---------------|---------------|
| vis0603-gpu-3 | vis0603-gpu-4 | vis0603-gpu-6 |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|

Example Block Topology visual with block with nodes less than min block size

block 1  : # of Nodes = 6
ClusterUUID + CliqueID : N/A N/A
** This block is ineligible for scheduling because # of nodes < min block size 8**
|---------------|---------------|---------------|
| vis0603-gpu-4 | vis0603-gpu-2 | vis0603-gpu-5 |
|---------------|---------------|---------------|
| vis0603-gpu-1 | vis0603-gpu-6 | vis0603-gpu-3 |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|
|       X       |       X       |       X       |
|---------------|---------------|---------------|

Example Tree topology visual:

Switch 5 (root)
├── Switch 0 (3 nodes)
│   ├── hpcbench-hpc-36
│   ├── hpcbench-hpc-39
│   └── hpcbench-hpc-42
├── Switch 1 (6 nodes)
│   ├── hpcbench-hpc-1
│   ├── hpcbench-hpc-35
│   ├── hpcbench-hpc-38
│   ├── hpcbench-hpc-41
│   ├── hpcbench-hpc-44
│   └── hpcbench-hpc-49
├── Switch 2 (3 nodes)
│   ├── hpcbench-hpc-37
│   ├── hpcbench-hpc-45
│   └── hpcbench-hpc-46
├── Switch 3 (2 nodes)
│   ├── hpcbench-hpc-40
│   └── hpcbench-hpc-43
└── Switch 4 (2 nodes)
    ├── hpcbench-hpc-47
    └── hpcbench-hpc-48

[aditigaur4]

When you have extremely big if else blocks-- its always best to condense them into functions.

if self.topo_type == TopologyType.BLOCK:
    visualize_block_topology()
else: 
    # assuming tree
    visualize_tree_topology()

[aditigaur4]

It would also be nice if visualize_topology* functions actually get moved to util since its not really part of core topology logic. You also dont really need any data from the topology class. Just the string and the block size. Thats an optional suggestion though.