(Incomplete) support for access control in PCI (pci_set_acl).

-script argument to service for crash recovery scripts
-config argument to service for driver resource configuration
restart command in service to restart a driver after a crash (for use in
crash recovery scripts).
down and refresh now take labels instead of pids.
verious changes in rs to make this work.

lib/syslib/Makefile.in

@@ -22,6 +22,7 @@ libsys_FILES=" \
 	pci_next_dev.c \
 	pci_rescan_bus.c \
 	pci_reserve.c \
+	pci_set_acl.c \
 	pci_slot_name.c \
 	safecopies.c \
 	sys_abort.c \