Fail NetworkConfig task on timeout
Fail NetworkConfig task on timeout

Running os-net-config as async, with failed_when as false
results in undefined variable error if async task times out.
Instead of ignoring failure of task, check for the
presense of results of the command execution 'rc', if it
is not defined, then rest of the tasks are not useful.
Closes-Bug: #1862627

Change-Id: Ibbcde856ac69bf73a47086d95a52c3b1a0d10911

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates