rumpdisk status

[Damien Zammit]

Hi all,

I think I managed to get the rumpdisk bootstrapped translator installed on a 
filesystem node,
but when I try to mount a second partition on the same disk it crashes the / 
partition. 

```
root@zamhurd:~# showtrans /dev/wd0s3
/hurd/storeio -T typed part:3:device:@/dev/rumpdisk:/dev/wd0
?2004hroot@zamhurd:~# mount /dev/wd0s3 /mnt -t ext2 
ext2fs: part:2:device:/dev/wd0: warning: FILESYSTEM NOT UNMOUNTED CLEANLY; PLEAS
E fsck
ext2fs: part:2:device:/dev/wd0: warning: FILESYSTEM NOT UNMOUNTED CLEANLY; PLEAS
E fsck
ext2fs: part:2:device:/dev/wd0: warning: UNCLEANED FILESYSTEM NOW WRITABLE
ext2fs: ../../libdiskfs/disk-pager.c:109: fault_handler: Assertion 'err' failed.

HANG
```

With this commit on top of hurd-sv master I get the above log:

http://git.zammit.org/hurd-sv.git/commit/?id=2225054243dc391e9bf13eebd95d099730fd5319

Damien