Reduce extraneous test output

The tests generate a large amount of extraneous logging output.
This due to the manage utility, when tested via test_manage,
setting up logging in it's own way. Monkey patching the log.setup
call to a no-op during tests prevents this.

Also fixed an incorrect usage of assert which was causing a
warning to be generated.

Change-Id: I6b8724142c0812d84e697e280acc0264620f6a2b
Merge "Reduce extraneous test output"
Update glance.openstack.common 

1. Sync openstack.common modules up to latest version
from oslo-inc. The follow modules got updated: 
 * fileutils
 * install_venv_common
 * lockutils
 * log
 * processutils

2. Add _i18n module as the dependency for new code.

3. Remove openstack.common.test module.
Glance and dependencies now use oslotest instead.

4. Remote unused openstack.common.excutils module.
Glance now use the module from oslo.utils instead.

5. Add missing modules back to openstack-common.conf.
Below ones are still using currently. But they will
be removed when the latest policy module get synced.
 * jsonutils
 * strutils

Change-Id: Ibbc2cda81a4e3c13643fe5c5bf6471c3f544add7
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>