Connection not being reused when sending events

[vikasra-seekout]

In Azure, instances of Node need to utilize outbound connections efficiently as there is a hard limit on the number of concurrent outbound ports (https://docs.microsoft.com/en-us/azure/load-balancer/troubleshoot-outbound-connection)

When profiling our use of outbound ports, we notice that mixpanel-node creates a very large number of connections since it is not leveraging connection pooling - this is causing us to exceed our SNAT thresholds and start failing requests. The library doesn't seem to support setting any configuration to override this behavior, any known workarounds?