reqmgr2 get implementation and test (initial version)
Merge branch 'master' of https://github.com/dmwm/WMCore into reqmgr2_get_post_test_clean_merge

Conflicts:
	src/couchapps/ReqMgr/views/childresubmissionrequests/map.js
Merge pull request #4713 from ticoann/reqmgr2_get_post_test_clean_merge

reqmgr2 get implementation and test (initial version)
ReqMgr2 request validation fixed

-unittests passing
-reqmgr.py client script --all_tests passing
-ReqMgr2 convenience bash wrapper script added
Merge pull request #4714 from zdenekmaxa/reqmgr2-validationfix

ReqMgr2 request validation fixed