Ensure insecure config option propagated by alarm evaluator

Fixes bug 1292130

Ensure insecure (i.e. non-cert-verifying) access over SSL to
keystone works from the alarm threshold evaluator for
statistics queries and alarm state transitions.

Change-Id: Idb94fa96a6a8b32bd071af1f73fd3172ae6948ad
Merge "Ensure insecure config option propagated by alarm evaluator"