DCOS-40376 Wait for deploy plan to kick off before checking for task state. (#2651)
DCOS-40376 Wait for deploy plan to kick off before checking for task state. (#2651)

* Wait for deploy plan to kick off before checking for task state for taskcfg test.

mesosphere/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons