Disable another FACE_DETECTION test [(#1253)](#1253)

Author: michaelawyu

videointelligence/samples/analyze/analyze_test.py

@@ -36,6 +36,8 @@ def test_analyze_shots(capsys):
     assert 'Shot 1:' in out
 
 
+@pytest.mark.xfail(reason='This feature is currently \
+    not visible to all projects.')
 @pytest.mark.slow
 def test_analyze_faces(capsys):
     analyze.analyze_faces(