Update go dependencies

vendor/github.com/gophercloud/gophercloud/openstack/utils/base_endpoint.go

@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"net/url"
+	"regexp"
+	"strings"
+)
+
+// BaseEndpoint will return a URL without the /vX.Y
+// portion of the URL.
+func BaseEndpoint(endpoint string) (string, error) {
+	var base string
+
+	u, err := url.Parse(endpoint)
+	if err != nil {
+		return base, err
+	}
+
+	u.RawQuery, u.Fragment = "", ""
+
+	versionRe := regexp.MustCompile("v[0-9.]+/?")
+	if version := versionRe.FindString(u.Path); version != "" {
+		base = strings.Replace(u.String(), version, "", -1)
+	} else {
+		base = u.String()
+	}
+
+	return base, nil
+}