Restore DBS Url in CouchDB

Also fix the issues with the DBSUrl and the clone API

Fixes #4498
Merge pull request #4515 from dballesteros7/DBSUrl-will-be-back

Restore DBS Url in CouchDB
0.9.54

Signed-off-by: Zdenek Maxa <zdenek.maxa@cern.ch>
ReqMgr request parameter DbsUrl stored in CouchDB

Correction of #4515
e.g. for MonteCarlo workload the DbsUrl was not really stored in CouchDB, even
though it was specified at injection, querying the request was returning None
for DbsUrl. As discussed with @efajardo, DbsUrl argument, once specified,
shall be stored for all types of workflows.

Fixes #4498
Correction of #4380 (DbsUrl should not have been removed, only fixed so that
it's properly stored in CouchDB, as done here now)
Merge pull request #4516 from zdenekmaxa/reqmgr-dbsurl-fix

ReqMgr request parameter DbsUrl stored in CouchDB
0.9.55

Signed-off-by: Zdenek Maxa <zdenek.maxa@cern.ch>
ReqMgr fixed unittets for #4516

Forgotten to re-run the unittests, fixed.
Merge pull request #4517 from zdenekmaxa/reqmgr-dbsurl-fix-unittests-fix

ReqMgr fixed unittets for #4516