Use wait_for_connection
Use wait_for_connection

wait_for and shell approaches were
flawed, wait_for_connection is the
right way to wait for an ansible
host to become available.

Change-Id: I1d8921e2d27c79b14a1ab28e3979d15589632b2f

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared