OAK-2328: add logging in OrderedContentMirrorStorateStrategy for better
investigation

Added trace logging for inspecting the exit condition and moved other logging to trace level.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1644106 13f79535-47bb-0310-9956-ffa450edef68
OAK-2323: SegmentMK consistency check
Initial implementation

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1644108 13f79535-47bb-0310-9956-ffa450edef68