Temporarily disable the is9600 FS server

It is currently too broken to be of any use anyway. Fixes are pending,
which is why this patch is intended to be reverted before those are
merged.

For the time being, the following tools can be used to access cdroms:
 - isodir
 - isoinfo
 - isoread
 - writeisofs

Change-Id: I681e8f1224bb464ba978f893dc18d46fa06a8208
small arm image script changes

	. let you specify IMG as a block device directly. this minimizes
	  i/o (only write used parts of the filesystem) and so turnaround
	  time - while still allowing the big default FS size.

Change-Id: Ib738499464e0d350a474a706f688d3f10806207d