CameraITS: add scene2/test_num_faces to check number of faces

Change-Id: I67a7c5a96704ba9f70c471a9adc7ed27deab7197
diff --git a/apps/CameraITS/pymodules/its/image.py b/apps/CameraITS/pymodules/its/image.py
index 62f43ec..d47a995 100644
--- a/apps/CameraITS/pymodules/its/image.py
+++ b/apps/CameraITS/pymodules/its/image.py
@@ -775,9 +775,9 @@
     """
     img_out = img
     if "flip" in sys.argv:
-        img_out = np.flipud(img_out)
+        img_out = numpy.flipud(img_out)
     if "mirror" in sys.argv:
-        img_out = np.fliplr(img_out)
+        img_out = numpy.fliplr(img_out)
     return img_out
 
 def stationary_lens_cap(cam, req, fmt):