To simplify running unit tests against os_data(), make the
_parse_os_release() function always callable to avoid needing to mock
os.path.isfile().
Signed-off-by: Benjamin Drung <benjamin.drung@profitbricks.com>
_run_ubuntu_os_grains_tests is only used once and does not provide any
useful abstraction since the introduction of _run_os_grains_tests.
Signed-off-by: Benjamin Drung <benjamin.drung@profitbricks.com>
_run_suse_os_grains_tests() and _run_ubuntu_os_grains_tests() share most
of their logic. Combine the common part in _run_os_grains_tests() and
let the remaining small parts live in their origin functions.
Signed-off-by: Benjamin Drung <benjamin.drung@profitbricks.com>
http://bugs.python.org/issue1322
python 3.7 is deprecating the platform.{linux_distribution,dist}
functions. They are being moved to the `distro` module on pypi. This
adds support for using the distro module if platform does not have the
needed functions.
