Remove unused oslo module and adjust opentstack-common.conf

The issues are detected by new change about update.py
in I68c0108304be8a315bcefe939c22019caab9bc98. This patch
doesn't depend the oslo-incubator patch.
 * remove unused module crypto
 * add missing module loopingcall in openstack-common.conf
 * sort the modules in openstack-common.conf

Change-Id: I9f0fcd3803f89a6902f92d0ea691b9ae0235f64c
Merge "Remove unused oslo module and adjust opentstack-common.conf"