Break apart root scenario tests
Break apart root scenario tests

The root actions group scenario tests were broken into separate parts
to facilitate parallel runs in the gate.

Change-Id: I63e995a2eda71183ef742d1091e7e871b53458a9
Partial-Bug: 1571092

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