quickstart, stable branch tests failing due to missing last known good build

[wes hayutin]

quickstart, stable branch tests failing due to missing last known good build

This impacts tripleo's internal tq/tqe branch testing for stable branches.

See internal jenkins:
sbtest-tripleo-quickstart-master-rdo_trunk

Hello rhos-dev-jenkins from Jenkins 2.60.3
setting property file for master
*** Unexpected missing LKG! Exiting...
Traceback (most recent call last):
  File "./lkg-getbuild.py", line 128, in <module>
    info = GetLkgCurrentBuild(r)
  File "./lkg-getbuild.py", line 55, in GetLkgCurrentBuild
    raise ValueError('Unexpected missing jenkins multijob success for job: %s' % job)
ValueError: Unexpected missing jenkins multijob success for job: rdo-master-promote-rdo_tru