Merge from Widevine repo of http://go/wvgerrit/94067
The android tests should use the staging provisioning server until
production is able to support core messages.
Test: ran WvCdmRequestLicenseTest.ProvisioningTest with v16 mod mock
Bug: 149622735
Change-Id: I4ec0cc8e8474dc4250e092473fef90d7358260de