For some reason it appears that the task to wait for nodes to come up
requires privilege escalation to work. I suspect this is due to
interation between ansible 2.5.4 and zuuls log streamer, but am not
sure. In the meantime this PS unblocks the gates.
Change-Id: I705f2ddf3facfe56838f606f88cfb15b822d18a5
Signed-off-by: Pete Birley <pete@port.direct>