Investigate and port patches on 0.90 branch that are not on 0.92/trunk branch.

There are several issues that have been committed in the 0.90 branch but were not in trunk/0.92 branch. These regressions should be "forward" ported.

HBASE-3320 !
HBASE-3380 ! -> HBASE-4610 is a jira to backports this, but it is not done.
HBASE-3410 !
HBASE-3501 !
HBASE-3714 !
HBASE-3729 !! Marked in 0.92 but not committed there, committed in 0.90 branch.
HBASE-3848 !
HBASE-3892 ! * Comments say trunk does not need.
HBASE-3906 !
HBASE-3989 !
HBASE-4109 !
HBASE-4160 !! Marked resolved 0.90.5, but no corresponding commit in either 0.90 or 0.92
HBASE-4423 !