[PATCH 0 of 2] TRAC 531 - Add source port logging for HTTP(S) error logging and all proxied email client connections

[Quanah Gibson-Mount]

The following patches ensure that the source port is logged for all client connections.  This is to resolve TRAC issue 531.  Belgium is mandating that the source port be logged for all client connections for Carrier Grade NAT.  This may soon extend to the entire European Union.