pylint: ignore pypi placeholders

pylint gets confused by duplicated package names, e.g. ipaplatform and
pypi/ipaplatform.

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>

Makefile.am

@@ -171,6 +171,7 @@ pylint: $(top_builddir)/ipapython/version.py ipasetup.py
 		-path './rpmbuild' -prune -o \
 		-path './freeipa-*' -prune -o \
 		-path './dist' -prune -o \
+		-path './pypi' -prune -o \
 		-name '.*' -o \
 		-name '*.in' -o \
 		-name '*~' -o \