[th/dhclient-pid-file] dhcp: store dhclient's pid file in /var/run/NetworkManager instead of /var/run
The pid-file is private to NetworkManager. It should reside in NetworkManager's run directory instead of "/var/run".
I don't think that changing this location can break existing uses. Why would somebody outside of NetworkManager care about this file?
This is a follow up to !145 (comment 163139)