ReqMgr2 - CouchDB request docs null fields

* some fields removed from CouchDB (useless)
* majority of other CouchDB fields is not properly set and updated (e.g.
  Status or Priority as changed on the request)
* reqmgr.py --allTests checks Oracle, CouchDB consistency, at least partly now

Fixes #4380
Merge pull request #4466 from zdenekmaxa/reqmgr2-couchdb-request-fields-updated

ReqMgr2 - CouchDB request docs null fields