Update Reboot marker for journald persistency check
Update Reboot marker for journald persistency check

Changes:
    - Before "-- Reboot --"    after
      Example:
      "-- Boot 88811756bcbe44bc823cc20751147b3c --"

Change-Id: I86ab5c0ea287c8a47e8d6fe30e71302b32510d8f
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

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