Fixes time out when applying updates to Triton machine metadata. (#6149)

* Add Triton Metadata modification AccTest.

The test starts the basic machine and then adds the metadata field
user_data.
Test fails if the user_data field does not match what we expect
OR it times out.

Related to #6148

* Fix the non-convergence of Triton metadata changes

The code waiting for the entire Machine Metadata to "deep equal" the Terraform
metadata modifications. These two sets will only be the same if the user
changes all metadata fields of the resource before calling `apply`.

Closes #6148

builtin/providers/triton/resource_machine.go

@@ -365,7 +365,12 @@ func resourceMachineUpdate(d *schema.ResourceData, meta interface{}) error {
 		err = waitFor(
 			func() (bool, error) {
 				machine, err := client.GetMachine(d.Id())
-				return reflect.DeepEqual(machine.Metadata, metadata), err
+				for k, v := range metadata {
+					if provider_v, ok := machine.Metadata[k]; !ok || v != provider_v {
+						return false, err
+					}
+				}
+				return true, err
 			},
 			machineStateChangeCheckInterval,
 			1*time.Minute,

builtin/providers/triton/resource_machine_test.go

@@ -115,6 +115,34 @@ func TestAccTritonMachine_firewall(t *testing.T) {
 	})
 }
 
+func TestAccTritonMachine_metadata(t *testing.T) {
+	machineName := fmt.Sprintf("acctest-%d", acctest.RandInt())
+	basic := fmt.Sprintf(testAccTritonMachine_basic, machineName)
+	add_metadata := fmt.Sprintf(testAccTritonMachine_basic, machineName)
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckTritonMachineDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: basic,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckTritonMachineExists("triton_machine.test"),
+				),
+			},
+			resource.TestStep{
+				Config: add_metadata,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckTritonMachineExists("triton_machine.test"),
+					resource.TestCheckResourceAttr(
+						"triton_machine.test", "user_data", "hello"),
+				),
+			},
+		},
+	})
+}
+
 var testAccTritonMachine_basic = `
 resource "triton_machine" "test" {
   name = "%s"
@@ -145,3 +173,17 @@ resource "triton_machine" "test" {
 	firewall_enabled = 1
 }
 `
+
+var testAccTritonMachine_metadata_1 = `
+resource "triton_machine" "test" {
+  name = "%s"
+  package = "t4-standard-128M"
+  image = "eb9fc1ea-e19a-11e5-bb27-8b954d8c125c"
+
+  user_data = "hello"
+
+  tags = {
+	test = "hello!"
+  }
+}
+`