Add `directory`, `prefix` and `suffix` properties to further customize
how access logs are configured on Tomcat. Relocate all properties to the
`server.tomcat.accesslog` namespace.

`server.tomcat.accessLogPattern` and `server.tomcat.accessLogEnabled` are
deprecated and replaced by `server.tomcat.accesslog.pattern` and
`server.tomcat.accesslog.enabled` respectively.

Closes gh-2491