[ADMIN_API] Fix gearman_stats bug

Change-Id: I9028e0b8ab8805f8ba2c849e6d6c951db3562fe2
[WORKER] Fix logic to find unplanned restarts

The logic to determine if HAProxy was restarted outside of the
worker's control was incorrect due to missing parenthesis.

Change-Id: I416ec7113491583646e033038a3b9e7cf58a6174