Add SRVHOST tab completion

A trivial update to @jlee-r7's code.

Author: wvu

lib/msf/ui/console/command_dispatcher/core.rb

@@ -2989,7 +2989,7 @@ def option_values_dispatch(o, str, words)
         option_values_target_addrs().each do |addr|
           res << addr
         end
-      when 'LHOST'
+      when 'LHOST', 'SRVHOST'
         rh = self.active_module.datastore['RHOST'] || framework.datastore['RHOST']
         if rh and not rh.empty?
           res << Rex::Socket.source_address(rh)