Remove useless unit test codes in test_policy

After some bug fixes patch merged, some unit test codes are
no longer valid, this patch clean those useless unit test
codes.

Related commits
3626b6db91ce1e897d1993fb4e13ac4237d04b7f
e4ac367561b3811a9cd94e51accdf8045b7d6adc

Fixes bug #1204563

Change-Id: I592d8cd8ac0b4e54d82e349a7dec6fa98c31a92f
Merge "Remove useless unit test codes in test_policy"