Do not expand macros, just print them unexpanded

[mcepl]

(for %pytest* and %pyproject* macros)

Also, write them in multiline more readable manner.

If anybody refactor shared code to special function/macro, I am all ears.

[mcepl]

From test on SLE-12:

abuild@stitny:/usr/src/packages/BUILD/python-rpm-macros> rpm --macros=macros.python_all -E "%pytest"
error: Macro %python_subpackages has unterminated body
%{python_expand PYTHONPATH=%{buildroot}%{$python_sitelib} PYTHONDONTWRITEBYTECODE=1 pytest-%{$python_bin_suffix} --ignore=_build.python2 --ignore=_build.python3 --ignore=_build.pypy3 -v }
abuild@stitny:/usr/src/packages/BUILD/python-rpm-macros>

No idea about that %python_subpackages macro, I haven’t changed anything there.

[scarabeusiv]

lgtm