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Repo and version pinning does not work yet

Rename snf-image-create-fixed-helper script to snf-image-create-helper.
Also remove the command that will create a tar archive of the helper
files under /tmp

Make it reflect the current state

When you run snf-image-create-fixed-helper an archive of the fixed
helper is created under /tmp

Move the old snf-image-update-helper to snf-image-create-fixed-helper
and make the new snf-image-update-helper download a fixed helper image
specified by the HELPER_URL variable.

Make sure everything works even when the root filesystem in the helper
VM is mounted read-only.

Make it comply with the rest of the software. Some things are not
ready yet.

Add a new HELPER_SIZE variable for this purpose. Default size is
hardcoded to 400MB

snf-image-update-helper will only install a pkg retrieved from the
apt unless -p option is specified.

This can be used to enable or disable the version check between
snf-image-host and snf-image-helper at the end of the update-helper
script.

Using package caches to create the helper image is dangerous now that
snf-image-helper is automatically retrieved.

If an error occurs, the temporary helper image under
/var/lib/snf-image-helper should be removed.

Conflicts:

	snf-image-host/snf-image-update-helper.in

Do not send through the monitor pipe the error messages. They may
contain internal sensitive information. Create a new report_error
function for sending errors through the monitoring pipe.

Conflicts:
	snf-image-host/create
	snf-image-host/snf-image-update-helper.in

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.

By default this directory is $(LOCALSTATEDIR)/cache/snf-image/helper

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

When snf-image-update-helper runned, it moved the kernel and the
initrd file out of the helper VM image. With this patch,
snf-image-update-helper will copy the kernel to the host without
removing it from the image.

Helper gets a dummy interface and communication between helper
and host is done via socat STDIO INTERFACE:eth0/vif$helperid.0
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Support launching helper domain on top of Xen hypervisor under PV mode.

Helper VM becomes hypervisor aware by passing hypervisor=$HYPERVISOR
in the kernel command line and thus acts accordingly (which logging
devices to use, what disk/floppy devices to expect, etc)

We separate all hypervisor specific functions and vars and source them
according to $HYPERVISOR env var.

Due to the fact that multiconsole for PV domains is supported only after
linux kernel 3.2 (Stefano Stabellini tree - branch 3.2-multiconsole-2
git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git

) all
output/error report and logging is done via hvc0.

Helper domain is debootstraped with 2 kernels (linux-image-amd64,
linux-image-xen-amd64) and is booted accordingly.

Floppy is not supported in PV so floppy is passed as another disk.

The images created can run on top of xen-hvm and xen-pvm hypervisor.

Change logging to start with HELPER_MONITOR_ in order to parse it when
having only one console.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

If snf-image-update-helper exits with errors, delete the temporary
image file from /var/lib/snf-image/helper.

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

the kernel and init paths computed by snf-image-update-helper script
were incorrect.

This file is used to check if the cache file contains every package
defined in HELPER_EXTRA_PKGS.

* If -y is not specified and a cache file is found, ask the user before
using it.
* "Fix" the -c option's behaviour. With this commit, if -c is applied,
the system will use the provided cache file if present and will do a
debootstrap if the file does not exist. The result of debootstrap will
be saved in the default cache file provided by the HELPER_CACHE_FILE
variable. This way, we do not need to provide an extra "disable cache
file option". One can run the program with -c "" to get this behaviour.

The system's architecture is needed by debootstrap.

Some files were accidentally left out from the last license and
copyright fix.

Also remove `-l' option. It's no longer needed.

Only activate the snf-image-helper automatically if the caller
has passed a magic argument in the kernel command line.

Require a '--force' argument to activate snf-image-helper,
to avoid accidental execution of the script.

This is really minor, but since we are using a bash var for losetup in
create, which is overwritable from the defaults file, lets keep it that
way.

 * Make all "local" variables lowercase.
 * Move HELPER_EXTRA_PKGS from snf-image-update-helper to common.sh
 * Protect all variables from spaces and other special chars
 * Remove extra X's from mktemp template names (only 6 are supported).
 * Make sure pipelines fail if any command (not only the rightmost)
   fails