oo-app-info: don't assume rhcloud.com app domain

Bug 1123944 - oo-app-info does not find gears / users based on app fqdn
https://bugzilla.redhat.com/show_bug.cgi?id=1123944

The search for an app fqdn was poorly implemented, as it assumed the
domain on the fqdn is rhcloud.com. This change generalizes the search to
use the configured cloud domain in the fqdn.

broker-util/lib/app_info.rb

@@ -87,7 +87,7 @@ def to_s()
 end
 
 class AppQuery
-  FQDN_REGEX = /(http:\/\/)?(\w+)-(\w+)(\.\w+)?\.rhcloud.com\Z/
+  FQDN_REGEX = /(http:\/\/)?(\w+)-(\w+)(\.\w+)?\.#{Regexp.escape(Rails.application.config.openshift[:domain_suffix])}\Z/
 
   #
   # Entrypoint for openshift application query methods