dev-python/docker-py: Use localhost instead of hostname in tests

Use 'localhost' in tests since it has a better chance of being
resolvable (via /etc/hosts) inside network-sandbox than the system
hostname.

Closes: https://bugs.gentoo.org/715052
Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/docker-py/docker-py-4.2.0-r1.ebuild

@@ -39,6 +39,14 @@ distutils_enable_sphinx docs \
 	'dev-python/recommonmark' \
 	'>=dev-python/sphinx-1.4.6'
 
+src_prepare() {
+	# localhost has a better chance of being in /etc/hosts
+	sed -e 's:socket[.]gethostname():"localhost":' \
+		-i tests/unit/api_test.py || die
+
+	distutils-r1_src_prepare
+}
+
 python_test() {
 	pytest -vv tests/unit/ || die "tests failed under ${EPYTHON}"
 }