[BEAM-725] Remove legacy credentials flags related to GCP and adopt application default credentials as only supported default flow

• Type: Improvement
• Status: Resolved
• Priority: P3
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Component/s: io-java-gcp
• Labels: backward-incompatible
• Assignee: Luke Cwik
• Reporter: Luke Cwik
• Created: 06/Oct/16 20:15
• Updated: 16/May/20 13:19
• Resolved: 07/Nov/16 21:24

Description

Drop the following GcpOptions and use ADC (https://developers.google.com/identity/protocols/application-default-credentials) to clean-up credentials story for GCP:
AuthorizationServerEncodedUrl
TokenServerUrl
CredentialDir
CredentialId
SecretsFile
ServiceAccountName
ServiceAccountKeyfile

Also migrate from Apiary Credentials class to Google OAuth Credentials class when available from google-cloud-java.

Issue Links

• links to: GitHub Pull Request #1294