Hardcode vscode-* package versions to versions shipped with 0.12.0

Author: ejizba

package.json

@@ -728,8 +728,8 @@
         "ps-tree": "^1.1.1",
         "request-promise": "^4.2.2",
         "semver": "^5.5.0",
-        "vscode-azureappservice": "^0.24.0",
-        "vscode-azureextensionui": "^0.18.3",
+        "vscode-azureappservice": "0.24.0",
+        "vscode-azureextensionui": "0.18.4",
         "vscode-azurekudu": "^0.1.8",
         "vscode-nls": "^2.0.2",
         "websocket": "^1.0.25",