MB-10151: tunable Memory UI

Change-Id: Ib9e99c1cd18ef983996a92b6a7380680acb289b2
Reviewed-on: http://review.couchbase.org/33438
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
MB-10151 Allow changing eviction policy.

Change-Id: I3e7318f39646f1633b8250baba9182ff584c5281
Reviewed-on: http://review.couchbase.org/33584
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Actualize bucket priority related messages.

Change-Id: Ia9e93953291fd0520f3a7d925999cce6e0546fa6
Reviewed-on: http://review.couchbase.org/33585
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>