rpc: allow for omitting the port when handling the Connect RPC

This commit slightly modifies the handling of the Connect RPC to allow
users to omit the port when specifying the target node to connect to.
If the port isn’t specified, then the default p2p port will be used in
place.

rpcserver.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"math"
 	"net"
+	"strconv"
 	"strings"
 	"time"
 
@@ -203,7 +204,17 @@ func (r *rpcServer) ConnectPeer(ctx context.Context,
 		return nil, err
 	}
 
-	host, err := net.ResolveTCPAddr("tcp", in.Addr.Host)
+	// If the address doesn't already have a port, we'll assume the current
+	// default port.
+	var addr string
+	_, _, err = net.SplitHostPort(in.Addr.Host)
+	if err != nil {
+		addr = net.JoinHostPort(in.Addr.Host, strconv.Itoa(defaultPeerPort))
+	} else {
+		addr = in.Addr.Host
+	}
+
+	host, err := net.ResolveTCPAddr("tcp", addr)
 	if err != nil {
 		return nil, err
 	}