[2.2] [WIP] [Security] Add method to retrieve ACLs by SecurityIdentities

Current implementation did not allow to fetch specific ACLs based on
SecurityIdentities. Note that this implementation is not performace
oriented and should reuse the code for hydration of ACLs and ACEs.

Changelog was updated to reflect the change.

@schmittjoh what are your thoughts on this?

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: no | Unrelated tests do not pass, Related tests pass
Fixes the following tickets: -
Todo: Update code performance
License of the code: MIT
Documentation PR: -