LU-930 doc: update MAINTAINERS file

LU-930 doc: update MAINTAINERS file

Update Patrick's email address, and remove John Hammond from the list.

Add some existing files to existing subsystems, and add a few new
subsystems for recently-landed code.

Re-order a couple of the entries to be in alphabetical order.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I297ec31abf65d54dc363b5d5fd460b7b3e3ebbe5
Reviewed-on: https://review.whamcloud.com/35241
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>