check_vpn: unit tests for ssh module
check_vpn: argument parsing test for openvpn
check_vpn: fixed is_specific_device function
check_vpn: more tests for core functionality
check_vpn: added unit tests for l2tp
check_vpn: more unit tests, device allocation
Merge pull request #10 from danfruehauf/check_vpn_shunit

check vpn: unit tests