Remove negative backup tests
Remove negative backup tests

The negative backup tests still fail in Redis
occasionally.  Removing them to stabilize the gate.

Change-Id: I573e5e09e55abeb51fbcfbbe2c2eb25bc8e127a6

zhangg/trove,openstack/trove,hplustree/trove,zhangg/trove,openstack/trove,hplustree/trove