root user pwd change (#637)

[IAM]: root user pwd change

What this PR does / why we need it
Added function to change root user password.

Reviewed-by: Artem Sh.
Reviewed-by: Anton Sidelnikov

acceptance/openstack/identity/v3/users_test.go

@@ -99,3 +99,25 @@ func TestUserLifecycle(t *testing.T) {
 	}
 	th.AssertEquals(t, userUpdateExt.Email, extendedUpdateOpts.Email)
 }
+
+func TestRootUserChangePassword(t *testing.T) {
+	// Don't run this test unless you want to fix your password in clouds.yaml later
+	if os.Getenv("OS_TENANT_ADMIN_USER_ID") == "" {
+		t.Skip("Policy doesn't allow NewIdentityV3AdminClient() to be initialized.")
+	}
+	if os.Getenv("OS_TENANT_ADMIN_PASSWORD") == "" {
+		t.Skip("Password not provided.")
+	}
+	if os.Getenv("OS_NEW_TENANT_PASSWORD") == "" {
+		t.Skip("New password not provided.")
+	}
+	client, err := clients.NewIdentityV3AdminClient()
+	th.AssertNoErr(t, err)
+
+	err = users.ChangePassword(client, users.ChangePasswordOpts{
+		UserId:           os.Getenv("OS_TENANT_ADMIN_USER_ID"),
+		OriginalPassword: os.Getenv("OS_TENANT_ADMIN_PASSWORD"),
+		NewPassword:      os.Getenv("OS_NEW_TENANT_PASSWORD"),
+	})
+	th.AssertNoErr(t, err)
+}

openstack/identity/v3/users/ChangePassword.go

@@ -0,0 +1,28 @@
+package users
+
+import (
+	golangsdk "github.com/opentelekomcloud/gophertelekomcloud"
+	"github.com/opentelekomcloud/gophertelekomcloud/internal/build"
+)
+
+type ChangePasswordOpts struct {
+	UserId           string `json:"-"`
+	OriginalPassword string `json:"original_password"`
+	NewPassword      string `json:"password"`
+}
+
+func ChangePassword(client *golangsdk.ServiceClient, opts ChangePasswordOpts) error {
+	b, err := build.RequestBody(opts, "user")
+	if err != nil {
+		return err
+	}
+
+	_, err = client.Post(client.ServiceURL("users", opts.UserId, "password"), b, nil, &golangsdk.RequestOpts{
+		OkCodes: []int{204},
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}