ERT-742 Fix the loading of the generated site_config.py file.
(cherry picked from commit e8993a0)
Merge pull request #590 from flikka/version-1.7

ERT-742 Fix the loading of the generated site_config.py file.
Bumped version number to 1.7.5
ERT-743: Merge remote-tracking branch 'refs/remotes/upstream/version-1.7' into version-1.7