Fixed 'execute_command()' missing 'opts' parameter

Author: epinna

modules/exploits/unix/http/vmturbo_vmtadmin_exec_noauth.rb

@@ -99,7 +99,7 @@ def check
     end
   end
 
-  def execute_command(cmd, opts)
+  def execute_command(cmd, opts = {})
     begin
     res = send_request_cgi({
       'uri'    => '/cgi-bin/vmtadmin.cgi',