OAK-709: fix compareAgainstBaseState that caused inconsistencies during Root#commit and adjust fixme to remind us of the open issue/discussion whether secure-states or the underlaying nodestates should be compared.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1466554 13f79535-47bb-0310-9956-ffa450edef68