Updated openstack/openstack
Project: openstack/ceilometer  6f2db7b46b123f9f5d6f1a31b7d84cca3c51e620

sync and clean up oslo

- remove strutils, lockutils, excutils, jsonutils, importutils
- sync to Change-Id: I6b720c462b8a562e3276f9e64d723bc36fb5c842

Change-Id: I4febcbb583529feffbdacb0b6a090ed5aa3b7a0f