Validate container status before next action

There should be status validation before doing container operation, for example
ubuntu@ubuntu16:~/.ssh$ zun container-list
+--------------------------------------+------+----------+---------------+-------------+--------+
| uuid | name | status | image | command | memory |
+--------------------------------------+------+----------+---------------+-------------+--------+
| 8b2b160c-2b80-46d0-be86-e29ebadf4afd | test | Creating | cirros:latest | sleep 10000 | None |
+--------------------------------------+------+----------+---------------+-------------+--------+

ubuntu@ubuntu16:~/.ssh$ zun container-list
+--------------------------------------+------+---------+---------------+-------------+--------+
| uuid | name | status | image | command | memory |
+--------------------------------------+------+---------+---------------+-------------+--------+
| 8b2b160c-2b80-46d0-be86-e29ebadf4afd | test | Stopped | cirros:latest | sleep 10000 | None |
+--------------------------------------+------+---------+---------------+-------------+--------+

There is an container status Creating, we can not start it (docker-py will raise 409 error) until it become Stopped,

For other example please refer #1614384 https://bugs.launchpad.net/zun/+bug/1614384