Refactor session initializer to remove resources/init/*.properties

Since 2.2, localization is configured in grouper.text.bundle.* properties in either grouper-ui.properties (2.2->2.4p54) or grouper.properties (2.4p55+). But the SessionInitialiser class is still looking at and setting a session variable based on grouper-ui configuration files resources/init.properties and resources/grouper/init.properties. Those session values don't appear to be doing anything during some light testing. In fact, you can't override the values anyway, since they are packaged in the grouper-ui jar.

They do seem to be harmless, but it would be nice to refactor that class to not deal with those property files, and then remove them from the jar.