skip file message: format everything in one call
skip file message: format everything in one call

I noticed that some logs reporting skip file messages seemed to
interleave multiple messages: That's not terribly surprising due to
concurrency.

This changes the message formatting a bit & does it all in one method
call to avoid the threading issues.

codeclimate/codeclimate-duplication,codeclimate/codeclimate-duplication,codeclimate/codeclimate-duplication,codeclimate/codeclimate-duplication