stg: require python2 rather than generic python executable

This patch fixes an issue with machines which have python3 and python2
installed. It requires the python2 executable by default in order to prevent
accidental use of the Python 3 series (which is not compatible.)

Signed-off-by: Jacob Keller <[email protected]>
Signed-off-by: Peter P Waskiewicz Jr <[email protected]>
6 files changed
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