disable the hardening role for PM MNAIO testing
disable the hardening role for PM MNAIO testing

the hardening role is kicking us out of the host while tempest is running
under the MNAIO PM job. This change disables the hardening role in the
MNAIO PM jobs which will improve deployment performance and allow tempest
tests to succeed, given the long runtime.

Issue: [RO-4125](https://rpc-openstack.atlassian.net/browse/RO-4125)
Signed-off-by: Kevin Carter <ffb54fded2f22052678e45d78b58d223654eb6fa@rackspace.com>

BjoernT/rpc-openstack,BjoernT/rpc-openstack,cloudnull/rpc-openstack,rcbops/rpc-openstack,rcbops/rpc-openstack,jacobwagner/rpc-openstack,jacobwagner/rpc-openstack,cloudnull/rpc-openstack