udevd - Break startup into pre and post mount parts
* Add a SIGHUP handler to udevd that will recreate the socket and pid
files, flush the current device database and read out a new one.
* Break the udevd rc.d script into udevd_early, to be run before
mountcritlocal and a dependency of lvm, and udevd, which is the
regular rc.d script which can be run at any time and on init takes
over from udevd_early.
* Adjust lvm rc.d script to depend on udevd_early instead of udevd.
Suggested-by: Sascha Wildner