1. Removing an if condition from scripts/policy/test_policy.py
    This conditional check is ambigous before doing an assert,
Only assert is enough to take care of the check.

2. In serial_scripts/policy/test_policy_serial.py changing warning
log messages to exception logs messages.

This commit is to address comments in an earlier review - 5278

Change-Id: If1711232946a377f4ec8b72f2305003b34862bd9
Merge "1. Removing an if condition from scripts/policy/test_policy.py     This conditional check is ambigous before doing an assert, Only assert is enough to take care of the check."