Land #8535, MSGRPC module minor fixes

lib/msf/core/rpc/v10/service.rb

@@ -76,6 +76,7 @@ class Service
 
   def stop
     self.service.stop
+    self.service.deref
   end
 
   def wait

plugins/msgrpc.rb

@@ -21,12 +21,12 @@ class Plugin::MSGRPC < Msf::Plugin
   #
   # The default local hostname that the server listens on.
   #
-  DefaultHost = "127.0.0.1"
+  DefaultHost ||= "127.0.0.1"
 
   #
   # The default local port that the server listens on.
   #
-  DefaultPort = 55552
+  DefaultPort ||= 55552
 
   #
   # ServerPort