common.helpers: simplify get_os_info()
For Linux this function now depends on distro (https://pypi.python.org/pypi/distro). The module has been recommended in https://bugs.python.org/issue1322.
For Linux this function now depends on distro (https://pypi.python.org/pypi/distro). The module has been recommended in https://bugs.python.org/issue1322.