[multipathd] Use udev socket as source of events instead of Netlink socket
[multipathd] Use udev socket as source of events instead of Netlink socket

When available. Keeps Netlink as a fallback.
Proper udev setup is required for this to work.
Patch to install such a setup follow.

Hannes Reinecke, Suse.

vijaychauhan/multipath-tools,vijaychauhan/multipath-tools,grzn/multipath-tools-explained,gebi/multipath-tools,unakatsuo/multipath-tools,unakatsuo/multipath-tools,grzn/multipath-tools-explained,unakatsuo/multipath-tools