MB-100: lowered babysitter memory usage

It's clearly wrong to tune babysitter to same "tons of ports and quick
malloc" settings as main VM. Because both eat tons of ram.

Particularly with this patch I'm seeing decrease in memory usage from
about 100 megs down to about 32.

Change-Id: Ieeb13057e67b9309b2a142972b910d50dc4337d9
Reviewed-on: http://review.couchbase.org/25774
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
MB-100: returned +MMmcs option for ns_server VM

It was somehow lost during babysitting VM work. And we clearly need it
back.

Change-Id: I9af4b177308e7455836971546f14d2b963af9cd1
Reviewed-on: http://review.couchbase.org/25775
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>