fix: fix fetch_id_token credential lookup order to match adc #748
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Jul 14, 2021
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fix: #747 #663 #728
(1) switch the metadata server and GOOGLE_APPLICATION_CREDENTIALS lookup order to match the adc order
(2) fix the metadata server exception by first sending a ping to metadata server to make sure metadata server exists
Tested on compute engine with this sample, and both service account json file and compute engine credentials.