MB-8980 correctly display node that is failed over and down

in the Servers section
- node url is not clickable (no way to see stats)
- expansion is off (no way to see gauges)
- status is "Down"
- buttons "Fail Over" and "Remove" are hidden
- message "Failed Over: Pending Removal" is displayed

Change-Id: I9e88f512b3703f3aba3c04bfbdeac6cefcd76da0
Reviewed-on: http://review.couchbase.org/28642
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Pavel Blagodov <stochmail@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>