Land rapid7#4968, print_error for msfconsole -r

Author: wvu

lib/msf/ui/console/driver.rb

@@ -423,6 +423,7 @@ def load_resource(path)
     elsif ::File.readable?(path)
       resource_file = ::File.read(path)
     else
+      print_error("Cannot find resource script: #{path}")
       return
     end