Replace accidentaly not expanded python macros

[scarabeusiv]

With %python_expand some people accidentaly use normal macros ie %python_expand %{python_sitelib} which should be %python_expand %{$python_sitelib}.

Known variables:

python_sitearch
python_sitelib
python_version
python_bin_suffix

If at the begining of the line is %python_expand and any of those variables is found without the $ we should replace it. @mcepl any other variables you can think of?

[scarabeusiv]

Another item is python call should be expanded to $python.