message: add managementgroups track2 config
diff: These settings apply only when `--python` is specified on the command line.
  Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
  -```yaml $(python)
  +```yaml $(python) && !$(track2)
  python:
  azure-arm: true
  license-header: MICROSOFT_MIT_NO_VERSION
  - namespace: azure.mgmt.managementgroup
  - package-name: azure-mgmt-managementgroup
  + namespace: azure.mgmt.managementgroups
  + package-name: azure-mgmt-managementgroups
  + package-version: 2019-05-01
  + clear-output-folder: true
  +```
  +```yaml $(python) && $(track2)
  +azure-arm: true
  +license-header: MICROSOFT_MIT_NO_VERSION
  +namespace: azure.mgmt.managementgroups
  +package-name: azure-mgmt-managementgroups
  package-version: 2019-05-01
  clear-output-folder: true
  ```
  -``` yaml $(python) && $(python-mode) == 'update'
  +``` yaml $(python) && $(python-mode) == 'update' && !$(track2)
  python:
  no-namespace-folders: true
  - output-folder: $(python-sdks-folder)/managementgroup/azure-mgmt-managementgroup/azure/mgmt/managementgroup
  + output-folder: $(python-sdks-folder)/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups
  ```
  -``` yaml $(python) && $(python-mode) == 'create'
  +``` yaml $(python) && $(python-mode) == 'create' && !$(track2)
  python:
  basic-setup-py: true
  - output-folder: $(python-sdks-folder)/managementgroup/azure-mgmt-managementgroup
  + output-folder: $(python-sdks-folder)/managementgroups/azure-mgmt-managementgroups
  +```
  +``` yaml $(python) && $(python-mode) == 'update' && $(track2)
  +no-namespace-folders: true
  +output-folder: $(python-sdks-folder)/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups
  +```
  +``` yaml $(python) && $(python-mode) == 'create' && $(track2)
  +basic-setup-py: true
  +output-folder: $(python-sdks-folder)/managementgroups/azure-mgmt-managementgroups
  ```
  