Rename PSC Client ID to PSC Connection ID

This is how the documentation and GCP UI/CLI call the field. Not sure where did we get
the _client_ from.

Author: igor-kupczynski

tlvparse/gcp.go

@@ -15,14 +15,14 @@ const (
 // a bool indicating one was found.
 func ExtractPSCConnectionID(tlvs []proxyproto.TLV) (uint64, bool) {
 	for _, tlv := range tlvs {
-		if linkID, err := pscClientID(tlv); err == nil {
+		if linkID, err := pscConnectionID(tlv); err == nil {
 			return linkID, true
 		}
 	}
 	return 0, false
 }
 
-// pscClientID returns the ID of a GCP PSC extension TLV or errors with ErrIncompatibleTLV or
+// pscConnectionID returns the ID of a GCP PSC extension TLV or errors with ErrIncompatibleTLV or
 // ErrMalformedTLV if it's the wrong TLV type or is malformed.
 //
 //	Field	Length (bytes)	Description
@@ -34,7 +34,7 @@ func ExtractPSCConnectionID(tlvs []proxyproto.TLV) (uint64, bool) {
 // will be decoded as 18446744072646845442.
 //
 // See https://cloud.google.com/vpc/docs/configure-private-service-connect-producer
-func pscClientID(t proxyproto.TLV) (uint64, error) {
+func pscConnectionID(t proxyproto.TLV) (uint64, error) {
 	if !isPSCClientID(t) {
 		return 0, proxyproto.ErrIncompatibleTLV
 	}