* Adds a new MapReduce job that builds a report of health of mob files
* Also builds background information on mob system use
* add a basic mob architecture in the ref guide to explain how mob takes the reference hfile value and finds the actual cell contents
* add a troubleshooting mob section to the ref guide to explain how to do a mob reference scan.
Signed-off-by: Peter Somogyi <psomogyi@apache.org>
(cherry picked from commit bc2f16274930e272767ce20ede27eb8fa4117241)
79134c8a3e