BMC uptime check retry
BMC uptime check retry

After 'OBMC Reboot (off)', the BMC uptime journald check fails
occasionally. This is due to the fact that the BMC uptime journald
entry may not have arrived yet.

Added retry code to improve our chances of success.

Change-Id: If76da840c7a5906d2cab7ce837f05f05fd2bcb6d
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation