Update release to new version and add config options

[ChrisMcGowan]

Bring this release up to date and add more configuration options

• Update the source oauth2-proxy package to latest version
• Change config options from command line to proxy config file
• Add under spec and additional options optional manifest value to allow proxy config file changes that are not defined to spec (this allows custom changes to OIDC behavior in the config on the fly instead of updating the release for new options)

Notes

• Test & document how to configure oauth proxy to restrict access based on uaa group memberships to control access

Acceptance Criteria

• Update package to latest release
• Move bin from command line options to config file
• Update templates to populate config file
• Add spec for manual config file population
• Test OIDC group restriction for access with uaa