hs: Updated synapse.http.client to handle DNSLookupErrors and bail immediately.
hs: Updated synapse.http.client to handle DNSLookupErrors and bail immediately.

iot-factory/synapse,howethomas/synapse,rzr/synapse,TribeMedia/synapse,illicitonion/synapse,howethomas/synapse,illicitonion/synapse,howethomas/synapse,howethomas/synapse,rzr/synapse,TribeMedia/synapse,iot-factory/synapse,TribeMedia/synapse,matrix-org/synapse,iot-factory/synapse,illicitonion/synapse,rzr/synapse,rzr/synapse,illicitonion/synapse,illicitonion/synapse,iot-factory/synapse,TribeMedia/synapse,howethomas/synapse,matrix-org/synapse,matrix-org/synapse,rzr/synapse,matrix-org/synapse,matrix-org/synapse,TribeMedia/synapse,matrix-org/synapse,iot-factory/synapse