use the Python interpreter from env
use the Python interpreter from env

use the Python interpreter which has been set via PYTHON env-var at
configure time

Signed-off-by: Neal Oakey <d8a7c9073f3da0bb1c0d763de104a2197401d85a@googlemail.com>
Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

bitemyapp/ganeti,onponomarev/ganeti,leshchevds/ganeti,ganeti/ganeti,yiannist/ganeti,grnet/snf-ganeti,andir/ganeti,apyrgio/snf-ganeti,dimara/ganeti,mbakke/ganeti,mbakke/ganeti,apyrgio/ganeti,mbakke/ganeti,bitemyapp/ganeti,ganeti/ganeti,dimara/ganeti,apyrgio/ganeti,leshchevds/ganeti,leshchevds/ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,yiannist/ganeti,apyrgio/snf-ganeti,andir/ganeti,ganeti-github-testing/ganeti-test-1,grnet/snf-ganeti,onponomarev/ganeti,andir/ganeti,yiannist/ganeti