Integrate kibana with google auth

Allows for additional SSO provider values to be passed along to es/kb. Adds an example for integrating with google auth in place of keycloak.

Closes #361 (closed).

chart/templates/logging/elasticsearch-kibana/values.yaml

@@ -34,6 +34,7 @@ sso:
   {{- list "endsession_url" .endsession_url | include "bigbang.addValueIfSet" | indent 2 }}
   {{- list "claims_group" .claims_group | include "bigbang.addValueIfSet" | indent 2 }}
   {{- list "claims_mail" .claims_mail | include "bigbang.addValueIfSet" | indent 2 }}
+  {{- list "cert_authorities" .cert_authorities | include "bigbang.addValueIfSet" | indent 2 }}
 {{- end }}
 {{- end }}