Allow use gh-ost on Galera / XtraDB cluster#780

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Gonlo2 wants to merge 15 commits intogithub:masterfrom

Added changes to use a cutover based on triggers
Juan Manuel Fernández García-Minguillán
committed
Remove triggers
Juan Manuel Fernández García-Minguillán
committed
Reverted
Juan Manuel Fernández García-Minguillán
committed
Added logic to insert events during trigger creation
Juan Manuel Fernández García-Minguillán
committed
Improved sanitize step
Juan Manuel Fernández García-Minguillán
committed
Added doc
Juan Manuel Fernández García-Minguillán
committed
Added correction fixes
Juan Manuel Fernández García-Minguillán
committed
Added doc and fixed queries
Juan Manuel Fernández García-Minguillán
committed
Fixed cut-over logic and changed doc

Juan Manuel Fernandez
authored and
Juan Manuel Fernández García-Minguillán
committed
Added logic to remove the triggers in case of error and created channel
Juan Manuel Fernández García-Minguillán
committed
Explained better method logic

Juan Manuel Fernandez
authored and
Juan Manuel Fernández García-Minguillán
committed
Fixed wait forever if not updates take place in the table during the cut-over

Juan Manuel Fernandez
authored and
Juan Manuel Fernández García-Minguillán
committed
Don't use singleton connection for the swap
Juan Manuel Fernández García-Minguillán
committed
Runned automatic formater
Juan Manuel Fernández García-Minguillán
committed
Improve sanitize message
Juan Manuel Fernández García-Minguillán
committed

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