LDEV-3275: Introduce SSO using Undertow mechanisms. Valves do not exist in Undertow. Another approach had to be used. In each WAR there is a file in META-INF/service dir which adds a class in request processing chaing. For Central it is SsoProducer which put the authenticated account into shared session. All other modules use SsoConsumer which takes the account and puts it into its security context.
In standalone.xml caching of credentials was switched off as it would prevent UniversalLoginModule from putting UserDTO into shared session.
TODO: use a simple pass-all authentication mechanism for static files like images and JS files.
LDEV-3275: Minify Ant .properties files. Most of the variables were constant, never changed. Since build file inheritance was introduced to LAMS, it is fairly easy to change relative paths in build files themselves. So only root path were left in .properties files and variables that can actually change from project to project.