CBD-836: add multiset/multiget xdcr lag stats

Change-Id: I2c478a40c9086cc3d907326e84f9e58995929eee
Reviewed-on: http://review.couchbase.org/24545
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>
MB-100: fix write permissions

Change-Id: I85786872178fb9f705ecc4ccb4289506d9b3f152
Reviewed-on: http://review.couchbase.org/24546
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>