dev-python/pytest: disable test_pdb

This test hangs/errors in an ebuild environment, but works fine
outside of an ebuild.

Bug: https://bugs.gentoo.org/598442
Package-Manager: Portage-2.3.6_p1, Repoman-2.3.2_p69

dev-python/pytest/pytest-3.0.3.ebuild

@@ -46,6 +46,9 @@ python_prepare_all() {
 	sed -e "s/return points/return {'py.test': target}/" -i setup.py || die "sed failed"
 	grep -qF "py>=${PY_VER}" setup.py || die "Incorrect dev-python/py dependency"
 
+	# https://bugs.gentoo.org/598442
+	rm testing/test_pdb.py || die
+
 	distutils-r1_python_prepare_all
 }