add a plugin to collect jar attributes

[sastryduri]

Description

Add a new plugin to collect hashes from jar files to assist in the identifying jar files accurately.

Expected feature output is as follows:

jar	"/var/lib/tomcat7/webapps/csf-sidecar-netflixoss/WEB-INF/lib/jsonevent-layout-1.6.jar"	
{ 
   "name":"jsonevent-layout-1.6.jar",
   "path":"/var/lib/tomcat7/webapps/csf-sidecar-netflixoss/WEB-INF/lib/jsonevent-layout-1.6.jar",
  "jarhash":"8a5b944970b75296c6b1e2b7d07363e8",
  "hashes"[
      "f55e7755c8842f3853014d4e3d2757b7", 
      "3180cfa6520d34f54bf276cfc05b5233",
      "d64f44596945decd8122dcdcc076c890"
  ]
}