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>