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img_porperties is not a mandatory parameter for diskdumps any more.

OS Parameters defined as command-line arguments should overwrite the
ones given in the variants file.

Many thanks to Brian Candler https://github.com/candlerb for the
suggestion and all the help.

If the parameter is not defined then the ChangePassword task will not
run at all.

This resolves #34

If the variant file has defined mandatory input variables like IMG_ID
the verification script should not fail to find them.

This fixes #35

This url points to a json file that contains the value for other
OS parameters. Using this file we can pass parameters to snf-image
without writting them in Ganeti's config.data. This is
useful, for 2 reasons:
* Privacy: We don't want the password to appear in the Ganeti config
* Speed: Some parameters like IMG_PERSONALITY can be quite large (a few
KB) and since ganeti shares the instance configuration among different
nodes, the overall system will start getting slower if many instances
with IMG_PERSONALITY exist.

 * Make sure `img_format', `img_passwd' and `img_id' are passed
 * If format is `diskdump', require the `img_properties` parameter

Also add ChangeLog and COPYING info

Those files are required by ganeti-os-interface