wic: reimplement getting paths of used tools

So far every used tool have to have separate property and
private attribute in the Disk class. This is too verbose,
considering that there will be much more tools used.

Reimplemented getting tools paths using custom __getattr__
method. This is much more compact and readable.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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