ReqMgr - removing wrong DBS URL from configuration

ReqMgr configuration defined:
dbs3 = 'http://vocms09.cern.ch:8989/dbs'
which is wrong. Was removed along with related code in the Announce module.
The results of handleAnnounce call here are at least questionable, pending Ops
feedback it may be removed altogether.
Merge pull request #4534 from zdenekmaxa/reqmgr-dbs3-url-removed-from-configuration

ReqMgr - removing wrong DBS URL from configuration