Add Rex::Virtualization::LibVirt::guestinfo to tests
Fix arp command path for Gentoo
Add tests for #238

Get IP and hostname from hosts file by alias.
Use passwd instead of chpasswd
Fix Rex::User::OpenWrt::get_user
Fix getpwnam output format for OpenWrt
Drop Rex::User::OpenWrt::rm_user and rm_group

Use the standard groupdel and userdel utilities instead.
Add Rex::User::OpenWrt::user_list
Fix typos in die messages
Add kernel module (un)loading support for OpenWrt
Add service status support for OpenWrt

This solution is implemented in OpenWrt's built-in service_check()
function as well but it seems that only a few initscripts using it so
far.

This also expects the executable name of the service which is sometimes
different from the service name.
Add tests for #238

Get IP and hostname from hosts file by alias.
Merge remote-tracking branch 'ferki/openwrt-user' into development
Merge remote-tracking branch 'ferki/openwrt-kmod' into development
Merge remote-tracking branch 'ferki/openwrt-service' into development
Merge remote-tracking branch 'ferki/hostalias' into development
Merge remote-tracking branch 'ferki/guestinfo' into development