Display 'realm\user' for AD instead of 'user@realm'

lib/metasploit/framework/credential.rb

@@ -70,8 +70,12 @@ module Metasploit
       end
 
       def to_s
+        if realm && realm_key == Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN
+          "#{self.realm}\\#{self.public}:#{self.private}"
+        else
           "#{self.public}:#{self.private}#{at_realm}"
         end
+      end
 
       def ==(other)
         other.public == self.public && other.private == self.private && other.realm == self.realm