disable windows defender, makes slow building images

scripts/docker/disable-windows-defender.ps1

+Set-MpPreference -DisableRealtimeMonitoring $true
\ No newline at end of file

windows_2016_docker_core.json

+{
+  "builders": [
+    {
+      "type": "virtualbox-iso",
+      "communicator": "winrm",
+      "iso_url": "{{user `iso_url`}}",
+      "iso_checksum_type": "{{user `iso_checksum_type`}}",
+      "iso_checksum": "{{user `iso_checksum`}}",
+      "headless": true,
+      "boot_wait": "2m",
+      "winrm_username": "vagrant",
+      "winrm_password": "vagrant",
+      "winrm_timeout": "6h",
+      "shutdown_command": "shutdown /s /t 10 /f /d p:4:1 /c \"Packer Shutdown\"",
+      "guest_os_type": "Windows2012_64",
+      "guest_additions_mode": "disable",
+      "disk_size": 61440,
+      "floppy_files": [
+        "{{user `autounattend`}}",
+        "./scripts/disable-winrm.ps1",
+        "./scripts/docker/enable-winrm.ps1",
+        "./scripts/microsoft-updates.bat",
+        "./scripts/win-updates.ps1",
+        "./scripts/oracle-cert.cer"
+      ],
+      "vboxmanage": [
+        [
+          "modifyvm",
+          "{{.Name}}",
+          "--memory",
+          "2048"
+        ],
+        [
+          "modifyvm",
+          "{{.Name}}",
+          "--cpus",
+          "2"
+        ]
+      ]
+    }
+  ],
+  "provisioners": [
+    {
+      "type": "windows-shell",
+      "scripts": [
+        "./scripts/vm-guest-tools.bat",
+        "./scripts/enable-rdp.bat"
+      ]
+    },
+    {
+      "type": "windows-restart"
+    },
+    {
+      "type": "powershell",
+      "scripts": [
+        "./scripts/docker/add-docker-group.ps1",
+        "./scripts/docker/install-docker.ps1",
+        "./scripts/docker/open-docker-insecure-port.ps1",
+        "./scripts/docker/remove-docker-key-json.ps1",
+        "./scripts/docker/disable-windows-defender.ps1"
+      ]
+    },
+    {
+      "type": "windows-restart"
+    },
+    {
+      "type": "windows-shell",
+      "scripts": [
+        "./scripts/compile-dotnet-assemblies.bat",
+        "./scripts/uac-enable.bat",
+        "./scripts/compact.bat"
+      ]
+    }
+  ],
+  "post-processors": [
+    {
+      "type": "vagrant",
+      "keep_input_artifact": false,
+      "output": "windows_2016_docker_core_{{.Provider}}.box",
+      "vagrantfile_template": "vagrantfile-windows_2016.template"
+    }
+  ],
+  "variables": {
+    "iso_url": "http://care.dlservice.microsoft.com/dl/download/1/6/F/16FA20E6-4662-482A-920B-1A45CF5AAE3C/14393.0.160715-1616.RS1_RELEASE_SERVER_EVAL_X64FRE_EN-US.ISO",
+    "iso_checksum_type": "md5",
+    "iso_checksum": "18a4f00a675b0338f3c7c93c4f131beb",
+    "autounattend": "./answer_files/2016_core/Autounattend.xml"
+  }
+}