Hive-4141 InspectorFactories use static HashMaps which fail in concurrent modification (Brock Noland via egc)

Submitted by: Brock Noland	
Reviewed by: Edward Capriolo	
Approved by: Edward Capriolo	


git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1456756 13f79535-47bb-0310-9956-ffa450edef68