Allow bin/install to signal failure on exit
Remove unused open3 dependency
Refactor file writing tests
Fix return values in GitlabKeys
Merge branch 'fail_install' of /home/git/repositories/gitlab/gitlab-shell
Merge branch 'remove_open3' of /home/git/repositories/gitlab/gitlab-shell
Stub file writing in tests
Merge branch 'gitlab_keys_return_values' of /home/git/repositories/gitlab/gitlab-shell
Version 1.8.0

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>