Narrow race in wait_for_server_status().

There's a narrow race condition in ServersClient.wait_for_server_status()
with a false negative reported when the expected state transition occurs
during the last build_interval period of the acceptable time window.

More likely to be seen if the build_time is shortened down from the
default 600s.

Change-Id: Ibe45df5d6689aa7a8a196b09744d7fcb4f183364
1 file changed