/openstack directory creation race

"TASK: [container_setup | Create Required local monitoring directories]" is targeted at all containers but delegated to each container's host. It creates /openstack/{backup,log}/{{container_name}} which requires /openstack to be created if it doesn't exist. If a host has multiple containers, this task may be delegated to the host multiple times in parallel, this creates a race to create /openstack. Example below:

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**15:17:37** failed: [node17_nova_conductor_container-faa11b22 -> node17] => (item=/openstack/backup/node17_nova_conductor_container-faa11b22) => {"failed": true, "item": "/openstack/backup/node17_nova_conductor_container-faa11b22", "parsed": false}
**15:17:37** OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
**15:17:37** debug1: Reading configuration data /etc/ssh/ssh_config
**15:17:37** debug1: /etc/ssh/ssh_config line 19: Applying options for *
**15:17:37** debug1: auto-mux: Trying existing master
**15:17:37** debug2: fd 3 setting O_NONBLOCK
**15:17:37** debug2: mux_client_hello_exchange: master version 4
**15:17:37** debug3: mux_client_forwards: request forwardings: 0 local, 0 remote
**15:17:37** debug3: mux_client_request_session: entering
**15:17:37** debug3: mux_client_request_alive: entering
**15:17:37** debug3: mux_client_request_alive: done pid = 18585
**15:17:37** debug3: mux_client_request_session: session request sent
**15:17:37** debug1: mux_client_request_session: master session id: 4
**15:17:37** Traceback (most recent call last):
**15:17:37** File "<stdin>", line 1928, in <module>
**15:17:37** File "<stdin>", line 238, in main
**15:17:37** OSError: [Errno 17] File exists: '/openstack'
**15:17:37** debug3: mux_client_read_packet: read header failed: Broken pipe
**15:17:37** debug2: Received exit status from master 1

**15:17:37** failed: [node17_cinder_api_container-a06914a1 -> node17] => (item=/openstack/backup/node17_cinder_api_container-a06914a1) => {"failed": true, "item": "/openstack/backup/node17_cinder_api_container-a06914a1", "parsed": false}
**15:17:37** OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
**15:17:37** debug1: Reading configuration data /etc/ssh/ssh_config
**15:17:37** debug1: /etc/ssh/ssh_config line 19: Applying options for *
**15:17:37** debug1: auto-mux: Trying existing master
**15:17:37** debug2: fd 3 setting O_NONBLOCK
**15:17:37** debug2: mux_client_hello_exchange: master version 4
**15:17:37** debug3: mux_client_forwards: request forwardings: 0 local, 0 remote
**15:17:37** debug3: mux_client_request_session: entering
**15:17:37** debug3: mux_client_request_alive: entering
**15:17:37** debug3: mux_client_request_alive: done pid = 18585
**15:17:37** debug3: mux_client_request_session: session request sent
**15:17:37** debug1: mux_client_request_session: master session id: 6
**15:17:37** Traceback (most recent call last):
**15:17:37** File "<stdin>", line 1928, in <module>
**15:17:37** File "<stdin>", line 238, in main
**15:17:37** OSError: [Errno 17] File exists: '/openstack'
**15:17:37** debug3: mux_client_read_packet: read header failed: Broken pipe
**15:17:37** debug2: Received exit status from master 1
**15:17:37**

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