If the directory name is empty, it should be treated as ".", the
current directory

Also fix some unicode issues

Encode it to UTF-8 before feeding it to kamaki, otherwise kamaki may
fail.

 * Add text/plain as content type in the md5sum file
 * Add application/json as content type in the meta file

Allow the user to upload the image to a different container than the
"images" one.

Export the image metadata as environment variables before running
scripts on the mounted image. This way the metadata will be visible
and can be used by the scripts if needed.

Allow the user to change the destination container when uploading
images.

This option can be used to prefix each output line with a timestamp.

If the user specifies /dev/null as output file, omit dumping the image.
This can be used for debug reasons.

Initialize the output modules in the beginning. Let the output instance
print the error message if a Fatal Error occurs.

If --syslog option is passed to snf-mkimage or snf-image-creator, the
program will log its output to syslog too.

This resolves #42

Convert all user defined metadata names to uppercase before locally
saving them to the metadata dictionary. The metadata names are case
insensitive and by converting them to uppercase we can ensure that at
any moment only one instance of them is present in the dictionary.

This fixes #39

Create a warning instead.

This resolves #36

Add indent=4 in the json dump execution

By default the output goes to sys.stdout. This is used in snf-mkimage
to output the plankton answer when registering an image to a synnefo
deployment.

This resolves #21

The base class is named Output. Having a method with the same makes
the code confusing.

This can be used to define scripts to run on the guest media after
mounting it under a directory in the host.

This resolves #13, resolves #14 and resolves #15

This option can be used to display the detected metadata of an image.

Order the arguments alphabetically.

Use qemu-nbd to export a QEMU image as raw where needed

This used to be a class in the util module, but since this is only used
on the Image, it suits better there.

This can be used to act on the original media instead of a device-mapper
snapshot.

This resolves #10

There is no need to associate a loop device with the input media if we
are not snapshotting the input media. The loop device is only needed in
order to use the media with the device-mapper.

Don't treat shrink as a seperated task. Add it in the syspreps menu.

If this is enabled, the program will try to install the specified VirtIO
drivers to the image.

Fix a bug where "$s" instead of "%s" was used in a string as a
placeholder.

This fixes #17

This attribute hosts the block device associated with this Disk
instance. This can be the original media if the source media is a block
device, a loop device of the original media if the original media is a
regular file or a loop device of a temporary object if the original
media is a directory.

Rewrite the mechanism to have better control on the system preparation
parameters. Also change the way the parameters are updated in the UI.

According to the decision of the GRNET Board of Directors,
switch license to GPLv3.

This commit will be propagated to the release
and master branches based on git flow, and the next
release will be licensed as GPLv3.

Remove the warning about having swapped the names of the snf-mkimage and
snf-image-creator executables. Keeping this warning for one major release
was enough.

Make snf-image-creator be the dialog-based program and snf-mkimage be
the command line one.

This can be used to perform various tests to determine if the media
is supported.

Add a new "Unsupported" os_type class. Images that get created from
unsupported media have the EXCLUDE_ALL_TASKS property enabled.

--print-sysprep should be --print-syspreps

The user may define parameters needed by the os_type classes to perform
the system preparation tasks.

A new needed_sysprep_params method is added to os_type.OSBase that
returns a list with parameters that should be defined by the user.