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As it currently is, python files are formatted using the general rules
in .editorconfig - this means that 8-character hard tabs are used, which
is not the recommended behaviour according to the PEP-8 standard.  This
patch correct this, and additionally limits the line length to 79
characters as required by the standard.

Change-Id: I3b5c0aff12034c4184d4555aab36490cdb3885da
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>