MB-5307 Replace ns_config:search by search_quick.

On my microbenchmark search_quick worked about 4 times faster.

Change-Id: Ie86770a7d635eea2661b123bd261927a83e82fc5
Reviewed-on: http://review.couchbase.org/25236
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
MB-5307 Don't log state when skipping janitor run.

The state can get quite large and consumes a lot of space in the
log. At the same time it doesn't seem to be overly valuable when
diagnosing issues.

Change-Id: I76bbb793b95f25a09ab11481acf50de114fb4b64
Reviewed-on: http://review.couchbase.org/25237
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>