fix: fix impersonated cred for gcloud #516
Merged
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(1) For IDTokenCredentials.refresh(self.request), use the provided
request instead of creating a new one
(2) For impersonated_credentials.Credentials, only refresh the source credentials if it is not
valid (in other words, expires within _helpers.CLOCK_SKEW=5 minutes). Also we need to remove the
expired
function (because it doesn't support clock skew), so it can fall back to theexpired
function defined ingoogle.auth.credentials.Credentials
interface which respect the clock skew.