dev-python/google-auth: Eliminate test-dep on oauth2client

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/google-auth/google-auth-2.3.0.ebuild

@@ -33,7 +33,6 @@ BDEPEND="
 		dev-python/grpcio[${PYTHON_USEDEP}]
 		dev-python/mock[${PYTHON_USEDEP}]
 		dev-python/moto[${PYTHON_USEDEP}]
-		dev-python/oauth2client[${PYTHON_USEDEP}]
 		dev-python/pyopenssl[${PYTHON_USEDEP}]
 		dev-python/pytest-localserver[${PYTHON_USEDEP}]
 		dev-python/pyu2f[${PYTHON_USEDEP}]
@@ -44,6 +43,12 @@ BDEPEND="
 
 distutils_enable_tests pytest
 
+EPYTEST_IGNORE=(
+	# these are compatibility tests with oauth2client
+	# disable them to unblock removal of that package
+	tests/test__oauth2client.py
+)
+
 python_install_all() {
 	distutils-r1_python_install_all
 	find "${ED}" -name '*.pth' -delete || die