Updated openstack/openstack
Project: openstack-infra/devstack-gate  c138c24f8b91e7bcdb7c90a33b4f99167e15c156
null
timestamp sublogs

the sublogs really need timestamps so they can be indexed in
logstash, and we can then actually understand when things might
be failing.

basic logic brought in from devstack, with some changes for
millisecond timing.

Change-Id: Iede34b970d090f855c701b69c1f5167a08ab9c52