spec: Do not install *.py[co] in python examples

spec: Do not install *.py[co] in python examples

Unfortunately, rpm is stupid enough to bytycompile python scripts even
though they are located in /usr/share/doc/libvirt-python-*/examples and
it does so after %install phase is finished. Thus there's no way we
could remove those files from BUILDROOT. As a workaround, we may safely
remove the examples subdirectory completely without losing anything. The
python scripts that were installed there are also copied directly into
/usr/share/doc/libvirt-python-*/ by

    %doc python/tests/*.py

rule. And yes, the files are actually tests, not examples.