Fix dev test
The device mapper has been added due to the xfsprogs package. This in
turn adds libdevmapper which is reponsible for the new device file.
console,0,0,character special file,5,1,console
fd,0,0,symbolic link,0,0,/proc/self/fd
full,0,0,character special file,1,7,full
+mapper,0,0,directory,0,0,mapper
null,0,0,character special file,1,3,null
ptmx,0,0,character special file,5,2,ptmx
pts,0,0,directory,0,0,pts
