Update cloudformation-template-ipsec

- Add "CreationPolicy" to notify the user when the setup script succeeds on the virtual machine. The stack fails if the script fails.
- The timeout is 10 minutes.
- This feature is to be tested on Debian(s). I have personally tested it on Ubuntu20.

aws/cloudformation-template-ipsec

@@ -320,6 +320,11 @@
         },
         "VpnInstance": {
             "Type": "AWS::EC2::Instance",
+            "CreationPolicy": {
+                "ResourceSignal": {
+                    "Timeout": "PT10M"
+                }
+            },
             "Properties": {
                 "UserData": {
                     "Fn::Base64": {
@@ -343,7 +348,20 @@
                                 },
                                 "'\n",
                                 "sleep 60\n",
-                                "wget https://git.io/vpnsetup -O vpnsetup.sh && sh vpnsetup.sh\n"
+                                "wget https://git.io/vpnsetup -O vpnsetup.sh && sh vpnsetup.sh\n",
+                                "apt-get install python3-pip -y\n",
+                                "pip3 install https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-latest.tar.gz\n",
+                                "cfn-signal ",
+                                "--stack ",
+                                {
+                                    "Ref": "AWS::StackName"
+                                },
+                                " --resource VpnInstance ",
+                                " --region ",
+                                {
+                                    "Ref": "AWS::Region"
+                                },
+                                "\n"
                             ]
                         ]
                     }