Switch to use test_utils.call_until_true

test.call_until_true has been deprecated since Newton on Tempest side,
and now Tempest provides test_utils.call_until_true as the stable
library method. So this patch switches to use the stable method before
removing old test.call_until_true on Tempest side.

Change-Id: I139b2ceeb9f840362ae4eeb06d391af4c83733ab
1 file changed
tree: 78f38f7b00be666aad356f0abda16a4553639797
  1. neutron/