Updated openstack/openstack
Project: openstack/horizon  830c2b62c807e24e228d1ecda71c3c8dcc7aa88c
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Remove unused openstack.common modules

They are not used in horizon code base and out-of-date for a long time.
It is time to remove them.
- notifier and rpc graduated oslo-incubator and are distirubted as a
  separate module (oslo.messaging).
- uuidutils is now deprecated in oslo and standard uuid module is
  recommended to use.
- For other modules, we can re-add them if they becomes needed.

Partial-Bug: #1296337
Change-Id: I7cb569954384fd39e9f91316f5e22ca63f4a00ee