Avoid using logging in signal handlers

Fixes bug 1029727

It is possible for logging to cause problems during signal handlers.
Fortunately, the logging we have in signal handlers is minimal and does
not add enough value to try to keep through workarounds.

Change-Id: I80708874c9740c906e5a49e0d9c1b45174470a85
Merge "Avoid using logging in signal handlers"
Merge remote-tracking branch 'm_src_repo/webob-issue' into build-temp