Fix issues with timer manager junits

Fix issues with timer manager junits

Attempt to fix intermittent issues with junit tests for timer manager.
Eliminated duplicate method in junit test and renamed another method.
Always release a semaphore, just to be sure.
Logged different message depending whether timer is cancelled or expired.
Locked access to the current time to prevent the timer thread from
accessing it while registering a new timer.

Change-Id: Icb499acb18197fd8042eb186f88b61d5c30daeb0
Issue-ID: POLICY-1542
Signed-off-by: Jim Hahn <jrh3@att.com>