Log msg for load policy file only if the file is actually loaded

The Load entry was previousy in init(), whereas it should have
been in _set_rules() which is invoked only when policies are
(re)loaded from the json file.

Change-Id: Ib4ce66569a64fc4be8f5f77d7f503cc93ac0006e
Merge "Log msg for load policy file only if the file is actually loaded"