remove idle timeout validation (#6500)
remove idle timeout validation (#6500)

Signed-off-by: Rama Chavali <rama.rao@salesforce.com>

Mirrored from https://github.com/envoyproxy/envoy @ 93c0fbb0db67e02427905c20aa325b587c4afe51

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api