Fix logging issue when services stop on py26

On older versions of python 2.6, exceptions would be spewed to the error
log whenever a service would stop.  This gets magnified by the
container-updater which seems to do it with every pass.  This catches
and squelches the error.

Change-Id: I5944c1620c62cf0868b70dae7d7e2acd56bf8211
Closes-Bug: #1306027