LU-579 MRP-120 changelog CLOSE event.

LU-579 MRP-120 changelog CLOSE event.

add CLOSE event into changelog, but not into the default mask.

do not create close changelog record sometimes, if a dup mfd handler appeared:
- open replay (1st mfd appears)
- re-connect
- open replay (2nd mfd appears)

Reviewed-by: Nathan Rutman <Nathan_Rutman@xyratex.com>
Reviewed-by: Alexey Lyashkov <alexey_lyashkov@xyratex.com>
Change-Id: I8e5ff99905b84ee58416406ca7b690c86db60c62
Signed-off-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
Reviewed-on: http://review.whamcloud.com/1197
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Mikhail Pershin <tappro@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>