Merge branch 'fix/python-recognise-optsfile-env-var' into 'master'
[python][setup-dunepy.py] Allow to set opts file via env variable like dunecontrol
See merge request !982 (merged)
(cherry picked from commit da691e89)
390f5690 [python][setup-dunepy.py] Allow to set opts file via env variable like dunecontrol