[ALL] Fix for Gearman SSL file check

Although options may not be defined in the config file, the keys
are still present in the CONF structure, but with None values.
We need to take that into consideration.

Change-Id: Id1915a55db3ae4f70895c9f94876e318743dcd19
[WORKER] Fix for saving stats on initial UPDATE

The HAProxy statistics socket file will not exist on a new device,
so attempts to save the stats before a reload would fail.

Change-Id: Ib31509bb7d68424d63f41b1c3032f15a1ca786e2