This patch updates os-collect-config so that the sleep interval
time is shortened if changes are detected. This should decrease
deployment time when using Heat templates which use depends_on
to step through a sequence of software deployment resources.
The new default sleep is set to 1 and increases
by sleep_time *= 2 until it reaches the default
sleep interval again.
Change-Id: I5cbd0956db2abebec876b15bee72b70ec64d5aef