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The official debian squeeze version does not accept the "--no-mtab" option
used when mounting filesystems in the helper

This is needed when updating the helper image using:
	snf-image-update-helper -c <package_name>

snf-image-helper does not make any use of it

Use squeeze instead of stable

The files hosted in this directory will be added in the
/etc/apt/preferences.d directory of the helper image before multistrap
runs.

snf-image-update-helper should check when creating a helper VM if
an snf-image-helper package was installed from an apt repository
through multistrap. If this is the case, snf-image-update-helper
should not complain about not finding the HELPER_PKG.

You can disable this behaviour by defining the DO_SYNC image property.

multistrap is more flexible allows as to define more that one
repository to retrieve packages from.