Implement a more capable servlet auditing interface.

In order to facilitate action-specific auditing, the RestResource,
RestView, and HttpServletRequest are incorporated into a new extended
audit event class, supplementing all existing fields (some redundant)
in HttpAuditEvent. Although the request is already available from the
Guice injector, adding this high-value information as a field
facilitates convenient access.

Change-Id: I3ebd629c90921237bbcfbb00d9ea990740099104
2 files changed