[leader_activities] Lower quorum timeout when unsafe is set.
[leader_activities] Lower quorum timeout when unsafe is set.

In all likelihood the use has already waited for the full quorum
timeout when trying to run (presumably) failover with unsafe option
unset and they want the unsafe failover to run quickly.

The timeout is close to but is still not zero as measure of last
resort.

Change-Id: Ic313fcb0b1a8700d85fcc8af0e57dffa16afdb07
Reviewed-on: http://review.couchbase.org/89576
Reviewed-by: Poonam Dhavale <6855f09986fe28ed7e8cdd9d60db878d898703d5@couchbase.com>
Tested-by: Aliaksey Artamonau <ce14b1c16e0fd654f926118eb8addbec5aff4ffa@couchbase.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server