[cfid-349] Add 404 and 500 pages to login server.

Avoids internal error stacktraces in the browser and tomcat's
default 404 page. Both URLs are implemented by the HomeController and
share the error.jsp page.

Change-Id: Ib2c59d979600867fe2faebf7e68fc1a8a6f50b86
Merge "[cfid-349] Add 404 and 500 pages to login server." into develop