Only important admin events should be audited by default

This is what our web UI says about auditing:

Auditing keeps track of important admin events occurring in Couchbase.

That was true in Spock when only a few events were logged.

If audit was enabled in 5.0 cluster, then all N1QL events will be enabled upon upgrade to 5.5:

> curl -s http://Administrator:password@172.23.133.13:8091/settings/audit | jq '.'

{

  "disabled": [

    20485,

    20488,

    20489,

    20490,

    20491

  ],

  "uid": "121393565",

  "auditdEnabled": true,

  "disabledUsers": [],

  "logPath": "/opt/couchbase/var/lib/couchbase/logs",

  "rotateInterval": 86400,

  "rotateSize": 20971520

}

Certain memcached events are disabled by default and that is the right behavior. All N1QL events are enabled though.

New deployments will be affected as well unless users/customers opt out.

MB-28274 and MB-28276 explain why SELECT and UPDATE statements probably should not be audited by default.