test/amazon/ebs: Add acceptance test for Session Manager Interface connectivity

Test Results
```
...

2020/10/29 09:35:39 ui:     test: Starting session with SessionId: wilken-00bcfae4d314f54e7
2020/10/29 09:35:40 [DEBUG] TCP connection to SSH ip/port failed: dial tcp [::1]:8047: connect: connection refused
2020/10/29 09:35:40 ui:     test: Port 8047 opened for sessionId wilken-00bcfae4d314f54e7.
2020/10/29 09:35:45 [INFO] Attempting SSH connection to localhost:8047...
2020/10/29 09:35:45 [DEBUG] reconnecting to TCP connection for SSH
2020/10/29 09:35:45 ui:     test: Connection accepted for session wilken-00bcfae4d314f54e7.
2020/10/29 09:35:45 [DEBUG] handshaking with SSH
2020/10/29 09:35:45 [DEBUG] SSH handshake err: ssh: handshake failed: ssh: invalid packet length, packet too large
2020/10/29 09:35:52 [INFO] Attempting SSH connection to localhost:8047...
2020/10/29 09:35:52 [DEBUG] reconnecting to TCP connection for SSH
2020/10/29 09:35:52 [DEBUG] handshaking with SSH
2020/10/29 09:35:52 [DEBUG] handshake complete!
2020/10/29 09:35:52 [DEBUG] Opening new ssh session
2020/10/29 09:35:53 [INFO] agent forwarding enabled
2020/10/29 09:35:53 ui: ==> test: Connected to SSH!
2020/10/29 09:35:53 Running the provision hook
2020/10/29 09:35:53 ui: ==> test: Stopping the source instance...
2020/10/29 09:35:53 ui:     test: Stopping instance
2020/10/29 09:35:54 ui: ==> test: Waiting for the instance to stop...
2020/10/29 09:36:25 ui: ==> test: Creating AMI packer-ssm-test-1603978447 from instance i-0853cb6186a3406d5
2020/10/29 09:36:25 ui:     test: AMI: ami-0868a41bbb2df77b3
2020/10/29 09:36:25 ui: ==> test: Waiting for AMI to become ready...
2020/10/29 09:37:59 ui: ==> test: Terminating the source AWS instance...
2020/10/29 09:37:59 ui error: ==> test: Bad exit status: -1
2020/10/29 09:38:15 ui: ==> test: Cleaning up any extra volumes...
2020/10/29 09:38:15 ui: ==> test: No volumes to clean up, skipping
2020/10/29 09:38:15 ui: ==> test: Deleting temporary security group...
2020/10/29 09:38:16 ui: ==> test: Deleting temporary keypair...
2020/10/29 09:38:16 Deregistering image ID (ami-0868a41bbb2df77b3) from region (us-east-1)
2020/10/29 09:38:17 Deregistered AMI id: ami-0868a41bbb2df77b3
2020/10/29 09:38:17 Deleted snapshot: snap-09602f15994bc9f51
--- PASS: TestBuilderAcc_SessionManagerInterface (249.87s)
PASS

```

builder/amazon/ebs/builder_acc_test.go

@@ -246,6 +246,14 @@ func checkBootEncrypted() builderT.TestCheckFunc {
 	}
 }
 
+func TestBuilderAcc_SessionManagerInterface(t *testing.T) {
+	builderT.Test(t, builderT.TestCase{
+		PreCheck: func() { testAccPreCheck(t) },
+		Builder:  &Builder{},
+		Template: testBuilderAccSessionManagerInterface,
+	})
+}
+
 func testAccPreCheck(t *testing.T) {
 }
 
@@ -350,6 +358,31 @@ const testBuilderAccEncrypted = `
 }
 `
 
+const testBuilderAccSessionManagerInterface = `
+{
+	"builders": [{
+		"type": "test",
+		"region": "us-east-1",
+		"instance_type": "m3.medium",
+		"source_ami_filter": {
+				"filters": {
+						"virtualization-type": "hvm",
+						"name": "ubuntu/images/*ubuntu-xenial-16.04-amd64-server-*",
+						"root-device-type": "ebs"
+				},
+				"owners": [
+						"099720109477"
+				],
+				"most_recent": true
+		},
+		"ssh_username": "ubuntu",
+		"ssh_interface": "session_manager",
+		"iam_instance_profile": "SSMInstanceProfile",
+		"ami_name": "packer-ssm-test-{{timestamp}}"
+	}]
+}
+`
+
 func buildForceDeregisterConfig(val, name string) string {
 	return fmt.Sprintf(testBuilderAccForceDeregister, val, name)
 }