dynamic forward proxy: restrict to ipv4 (#1023)
dynamic forward proxy: restrict to ipv4 (#1023)

Envoy Mobile currently does not handle IPV6 connections, and they fail with local 503s. This PR forces IPV4 for now until we add support in https://github.com/lyft/envoy-mobile/issues/1022.

Signed-off-by: Michael Rebello <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@michaelrebello.com>
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile