### Please describe the problem.

When the annex directory has a non-ascii character (like a tilde) on its path, local pairing fails and a couple of instances of the following message appear on the log

"illegal control characters in pairing message; ignoring"

### What steps will reproduce the problem?

* make a new annex repo named on /home/someone/Vídeos/blah/ (notice the i with a tilde) on two computers
* try to pair them

### What version of git-annex are you using? On what operating system?

git-annex version: 5.20141016-g26b38fd on Arch Linux

git-annex version: 5.20140717 on Ubuntu 14.10
