Make ManagerWithFind abstract and fix its descendants

ManagerWithFind requires list() method in its descendants.
Make it abstract and fix its improper descendants that do
not implement list() (QuotaSetManager and others).

Change-Id: I691ca389b5fea4c1bb36499a264b578fa825bbbf
Fixes: bug #1180393
Merge "Make ManagerWithFind abstract and fix its descendants"