Cleanup known_hosts ip's
Cleanup known_hosts ip's

Added cleanup of the hypervizor's known_host file
by removing VM's ip addresses.

Change-Id: I8a56d575ab2f8c81e58e8f18f608210eef89fb16

okolisny/InfraRed,redhat-openstack/infrared,okolisny/InfraRed,redhat-openstack/infrared,okolisny/InfraRed,redhat-openstack/infrared