Power on restore test wait for BMC online

We have started testing power on restore to verify the recent
power on restore policy code which went in. The does PDU power
cycle but the wait for BMC to come online needs to be updated
so that it can reliably do the REST operation on BMC post the
power cycle.

Resolves openbmc/openbmc-test-automation#147

Change-Id: I310a30e33268eb7d72b499d34f59656568f8454e
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
1 file changed