Javier Pena 6bd4924cec Ignore stderr when checking for Python version ...

https://review.openstack.org/504171 prevented Python version detection
from failing when python3 is not installed. However, "which python3"
returns a message in stderr when python3 is not there, and this output
can make diskimage-builder get confused when parsing
source-repository-images.

Change-Id: Idb649dc341ede73c39954b0432ef3cacf379ed37

2017-09-15 15:57:32 +02:00

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