Currently, user's identity headers are always inserted to downstream
request. For privacy reason, it would be better to not insert these
headers by default, and let user chose whether to include these headers
per=policy basis.
Fixes#702
* config: add RemoveRequestHeaders
Currently, we have "set_request_headers" config, which reflects envoy
route.Route.RequestHeadersToAdd. This commit add new config
"remove_request_headers", which reflects envoy RequestHeadersToRemove.
This is also a preparation for future PRs to implement disable user
identity in request headers feature.
* integration: add test for remove_request_headers
* docs: add documentation/changelog for remove_request_headers
* integration-tests: switch to go for backends to support TLS scenarios
* fix apply order
* generate additional tls certs
* integration-tests: tls_skip_verify option
* integration-tests: wait for openid to come up before starting authenticate
* add tls_server_name test
* add test for tls_custom_ca
* increase setup timeout to 15 minutes
* fix secret name reference
* mtls wip
* mtls wip
* add test for client_cert
