FWaaS - fix reordering of rules in policy

Due to a recent change, reodering of rules within the
same policy was failing. This is fixed by checking if
the rules belong to the same policy we allow reordering.

There was also a missing call to reorder due to which
the position number on the rules was not reflected correctly
after the reordering. This is also fixed.

Closes bug: #1226941

Change-Id: I7f52e8b9d578c290ace3bb615bf68bd213398303
Merge "FWaaS - fix reordering of rules in policy"