In Queens, we support the old way to use pool_group and the
new way without it in Flavor both. In Stein, we will remove
the pool_group totally and only keep the new way in Flavor
and Pool.
The patch remove the pool group totally
Change-Id: I64fa5fde35f9b9f2e8aa4977eb2c253ffc6aee99
Implements: bp remove-pool-group-totally
1675364c91