CBQE-1379 Rename conf file for all backup job. Remove redundant conf file

Also put the correct priority number for those backup restore test

Change-Id: Ie3a096a65cc713c5c7606962421c2c5c7028bd46
Reviewed-on: http://review.couchbase.org/27301
Tested-by: Chisheng Hong <chisheng@couchbase.com>
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>