testnode: Avoid job failure due to fs loop

testnode: Avoid job failure due to fs loop

Example:

failed: [smithi205.front.sepia.ceph.com] (item=/var/run/) => {"changed": false, "cmd": "find /var/run/ -name \"*ceph*\"", "delta": "0:00:00.004976", "end": "2017-09-29 18:42:23.050412", "failed": true, "failed_when_result": true, "item": "/var/run/", "rc": 1, "start": "2017-09-29 18:42:23.045436", "stderr": "find: File system loop detected; '/var/run/rpc_pipefs/gssd' is part of the same file system loop as '/var/run/rpc_pipefs'.", "stderr_lines": ["find: File system loop detected; '/var/run/rpc_pipefs/gssd' is part of the same file system loop as '/var/run/rpc_pipefs'."], "stdout": "", "stdout_lines": []}

Signed-off-by: David Galloway <dgallowa@redhat.com>