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It connects to a Pithos backend and either fetches
the data of a file or returns its size.

Refs #1745

Image properties should be an optional argument. In any other case
snf-image does not retail backward compatibility.

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

The task tried to run inject-files.py even if SNF_IMAGE_PERSONALITY
variable was empty, which led to error.

Only the users defined by SNF_IMAGE_PROPERTY_USERS var will have their
passwords changed by ChangePassword task.

Make minor modifications to string handling in inject-files.py,
also fix some PEP8 errors.

The bug was triggered when a variable contained new lines

Now injected files may include user defined permition and ownership
information.

This way the scripts won't fail if someone adds input arguments after
the program name inside the variable.

This task needs InstallUnattend

This task is deleted from the repository. It's functionality was merged
with InstallUnattend

The password is applied in oobeSystem and RDP is enabled in a previous
pass. I Also did a cleanup on the windows tasks.

Since curl is needed to find remote file sizes, lets do the whole
downloading with curl.

The should look like this: SNF_IMAGE_PROPERTY_<TASK_NAME>_TASK

* Add code to compute the remote filesize
* Check for wget and curl in the configuration phase

* In decode-properties.py, use subprocess.Popen method instead of
  subprocess.check_output, which is introduced in python 2.7

* Fix a bug in snf-image-helper where decode-properties.py was not
  properly called

* Fix a bug in FixPartitionTable task

All tasks should be bash scripts that source common.sh. We have also
fixed BUG #1577