Change the AccessLogValve pattern

The existing pattern doesn't show the IP address of the original requester.
This change adds a value of '%{org.apache.catalina.AccessLog.RemoteAddr}r' to
show the IP address of the original requester as provided by the RemoteIpValve.
'%a' will continue to show the IP address of the Router.

See: https://github.com/cloudfoundry/java-buildpack/issues/75

[#75588342]