changing plugin apis to accept unit criteria
using search_all_unit_ids conduit call instead of more time consuming search_all_units call
removing unwanted additional step
updating errata profiler to load units from criteria, doc update and renaming
updating the name of conduit search units call as per platform changes
updating the name of conduit search units call as per platform changes
unit test updates
Merge pull request #201 from pulp/skarmark-applicability

 changing plugin apis to accept unit criteria and process units