do not parse url from configured host

now that the scheme is not required in the configuration file, we can
assume the configured value is correct. as with other uses, the
configured value is only used when noth host and user are present.

config/options.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"net/url"
 	"strings"
 
 	"github.com/cloudfoundry/jibber_jabber"
@@ -99,9 +98,9 @@ func HostDirectory(c *cli.Context) (string, error) {
 		return hostFlag, nil
 	}
 
-	u, err := url.Parse(cfg.Default.Host)
-	if err != nil {
-		return "", err
+	if cfg.Default.Host != "" && cfg.Default.User != "" {
+		return cfg.Default.Host, nil
 	}
-	return u.Hostname(), nil
+
+	return "", nil
 }