use dep as denpendency managment tool

vendor/github.com/go-openapi/swag/net.go

@@ -1,24 +0,0 @@
-package swag
-
-import (
-	"net"
-	"strconv"
-)
-
-// SplitHostPort splits a network address into a host and a port.
-// The port is -1 when there is no port to be found
-func SplitHostPort(addr string) (host string, port int, err error) {
-	h, p, err := net.SplitHostPort(addr)
-	if err != nil {
-		return "", -1, err
-	}
-	if p == "" {
-		return "", -1, &net.AddrError{Err: "missing port in address", Addr: addr}
-	}
-
-	pi, err := strconv.Atoi(p)
-	if err != nil {
-		return "", -1, err
-	}
-	return h, pi, nil
-}