set swagger-to-sdk repotag 'azure-sdk-for-python-track2' for mgmt plane config file (#14666)
set swagger-to-sdk repotag 'azure-sdk-for-python-track2' for mgmt plane config file (#14666)

* don't use multiapi_init_gen in track2

* use azure-sdk-for-python-track2

* refactor

* set track2 by config
Azure/azure-sdk-for-python,Azure/azure-sdk-for-python,Azure/azure-sdk-for-python,Azure/azure-sdk-for-python