Disable retry_policy in AuthService
Disable retry_policy in AuthService

`retry_policy` is not supported in an ext_authz filter in Envoy.
Now that we're updating Envoy, it has started complaining about
this incorrect field. This commit removes this field as this has
no effect on the retry policy, plus it misdirects the end user.

datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador