Fixes automatic testing of TaskChain requests

TaskChain requests JSON template files had CouchURL argument defined. Which
overrides ConfigCacheUrl. This could have possibly worked only on the defined
host which was testbed, but failed with CouchInternalError otherwise.
Merge pull request #4489 from zdenekmaxa/reqmgr2-couchdb-database-consistency-fix

Fixes automatic testing of TaskChain requests
0.9.51

Signed-off-by: Zdenek Maxa <zdenek.maxa@cern.ch>
Add support for the splitting page in reqmgr.py

Add basic support for changing the splitting
with the reqmgr.py script, it is available
through another section in the JSON files.

Also incorporate splitting change in the
allTests procedure.
Merge pull request #4470 from dballesteros7/extendReqMgrScript

Add support for the splitting page in reqmgr.py