Triage failure cases from when CI was down

[jpienaar]

c5f57ec

• TFLITEHUB :: bird_classifier_test.py
• TFLITEHUB :: lightning_i8_test.py
• TFLITEHUB :: magenta_test.py
• TFLITEHUB :: mobilenet_ssd_quant_test.py
• TFLITEHUB :: mobilenet_v2_uint8_test.py
• TFLITEHUB :: ssd_mobilenet_v1_uint8_test.py
• TFLITEHUB :: visual_wake_words_i8_test.py