Driver mapping refactory.

VFS CHANGES:
- dmap table no longer statically initialized in VFS
- Dropped FSSIGNON svrctl call no longer used by INET

INET CHANGES:
- INET announces its presence to VFS just like any other driver

RS CHANGES:
- The boot image dev table contains all the data to initialize VFS' dmap table
- RS interface supports asynchronous up and update operations now
- RS interface extended to support driver style and flags

drivers/memory/ramdisk/rc

@@ -5,15 +5,15 @@ exec >/dev/log
 exec 2>/dev/log
 exec </dev/null
 
-/bin/service -c up /bin/pci -config /etc/system.conf
-/bin/service -c up /bin/floppy -config /etc/system.conf -dev /dev/fd0
+/bin/service -cn up /bin/pci -config /etc/system.conf
+/bin/service -cn up /bin/floppy -config /etc/system.conf -dev /dev/fd0
 if [ X`/bin/sysenv bios_wini` = Xyes ]
 then
 	echo Using bios_wini.
-	/bin/service -c up /bin/bios_wini -dev /dev/c0d0
+	/bin/service -cn up /bin/bios_wini -dev /dev/c0d0
 else
-	/bin/service -c up /bin/at_wini -dev /dev/c0d0 -config /etc/system.conf -label at_wini_0
-	/bin/service -c -r up /bin/at_wini -dev /dev/c1d0 -config /etc/system.conf -label at_wini_1 -args ata_instance=1
+	/bin/service -cn up /bin/at_wini -dev /dev/c0d0 -config /etc/system.conf -label at_wini_0
+	/bin/service -cnr up /bin/at_wini -dev /dev/c1d0 -config /etc/system.conf -label at_wini_1 -args ata_instance=1
 fi
 
 rootdev=`sysenv rootdev` || echo 'No rootdev?'