repo sync uses non-thread-safe subprocess from threads about git-repo

[GoogleCodeExporter]

Using subprocess32 didn't help, but I'm not 100% convinced that the version of 
git-repo that ran from the crontab actually used it - there are different 
versions of git-repo in different locations and it can be difficult to make 
sure that the expected version is running.  The fact remains that subprocess is 
not thread-safe, and methods should not be called from a thread.

Original comment by [email protected] on 17 Dec 2015 at 3:45