Updated openstack/openstack
Project: openstack/python-ceilometerclient  b08cbfeb313ccf075df1b316c1e7332d67532d66

use mock instead of try...finally

There are some test code use try...finally block to catch or ignore
the stdout message. The job can be done by mock too, and it is cleaner.

Change-Id: I0c29382e7bcd0b7f399565b26f27315f7e17a8fc