CBD-816 Basic UI support for recovery mode.

When cluster is in recovery mode, servers section will have
additional button to abort the recovery. Rebalance, fail over and
other similar buttons will be disabled.

Change-Id: I88db22066dade6a97b2acf38b10aa04d370cf7e9
Reviewed-on: http://review.couchbase.org/25242
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
CBD-816: bump mb_master_advertised_version to [2, 0, 2]

So that 2.0.2 node takes over 2.0.1.

Change-Id: Ib0d22e34aeebdab9872ff4dad070847c744b6338
Reviewed-on: http://review.couchbase.org/25323
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
CBD-816: log dropping of recovery status into ns_log

It deserves to be very visible.

Change-Id: I92d1db7f5d30b686e0b195d6bed7cd72f6e6887b
Reviewed-on: http://review.couchbase.org/25324
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>