ReqMgr2 project startup

-REST service based on WMCore.REST (new REST API)
-some example plus request list, query REST API
-configuration defined, called from deployment/reqmgr2/config.py
-startup of web GUI implemented in JavaScript, calling service's REST APIs
-couchapp ReqMgr (after initial clean up remained 1 view) shared between
ReqMgr1 and ReqMgr2 (validation, update already previously implemented),
necessary view will be addded
-CouchDB database (reqmgr_workload_cache) behind, shared with ReqMgr1