destroy_tests.sh breaks the Ironic gate

[Rich Wellum]

Referring to: https://review.openstack.org/#/c/484991/ - this PS temporarily disables this script as it's caused the Ironic gate to fail.

Example of the failure log is:

http://logs.openstack.org/05/485905/1/check/gate-kolla-kubernetes-deploy-centos-source-4-ironic-nv/360b62f/console.html.gz#_2017-07-21_01_49_19_534349

2017-07-21 01:49:19.534349 | + exit 1
2017-07-21 01:49:19.534519 | ++ tests/bin/gate_capture_logs.sh 1
2017-07-21 01:49:19.550831 | Capturing error logs.
2017-07-21 01:49:32.353824 | libvirt: XML-RPC error : Failed to connect socket to '/var/run/libvirt/libvirt-sock-ro': No such file or directory
2017-07-21 01:49:32.354368 | Traceback (most recent call last):
2017-07-21 01:49:32.354412 | File "/usr/lib/python2.7/site-packages/pyghmi/ipmi/bmc.py", line 173, in handle_raw_request
2017-07-21 01:49:32.356740 | return self.get_chassis_status(session)
2017-07-21 01:49:32.356850 | File "/usr/lib/python2.7/site-packages/pyghmi/ipmi/bmc.py", line 89, in get_chassis_status
2017-07-21 01:49:32.356909 | powerstate = self.get_power_state()
2017-07-21 01:49:32.356964 | File "/usr/lib/python2.7/site-packages/virtualbmc/vbmc.py", line 97, in get_power_state
2017-07-21 01:49:32.357671 | with utils.libvirt_open(readonly=True, **self._conn_args) as conn:
2017-07-21 01:49:32.357750 | File "/usr/lib/python2.7/site-packages/virtualbmc/utils.py", line 52, in __enter__
2017-07-21 01:49:32.358035 | raise exception.LibvirtConnectionOpenError(uri=self.uri, error=e)
2017-07-21 01:49:32.358134 | LibvirtConnectionOpenError: Fail to establish a connection with libvirt URI "qemu:///system". Error: Failed to connect socket to '/var/run/libvirt/libvirt-sock-ro': No such file or directory
2017-07-21 01:49:43.641175 | [Zuul] standard output/error still open after child exited2017-07-21 01:49:43.641222 | [Zuul] Task exit code: 255
2017-07-21 01:49:46.335606 | [Zuul] Job complete, result: FAILURE