[AutoPR batch/resource-manager] Dev batch microsoft.batch 2019 04 01- Fix swagger spec incorrect nullable property

[AutorestCI]

Created to sync Azure/azure-rest-api-specs#5720

[AutorestCI]

(message created by the CI based on PR content)

Installation instruction

Package azure-mgmt-batch

You can install the package azure-mgmt-batch of this PR using the following command:
pip install "git+https://github.com/Azure/azure-sdk-for-python@restapi_auto_5720#egg=azure-mgmt-batch&subdirectory=azure-mgmt-batch"

You can build a wheel to distribute for test using the following command:
pip wheel --no-deps "git+https://github.com/Azure/azure-sdk-for-python@restapi_auto_5720#egg=azure-mgmt-batch&subdirectory=azure-mgmt-batch"

If you have a local clone of this repository, you can also do:

• git checkout restapi_auto_5720
• pip install -e ./azure-mgmt-batch

Or build a wheel file to distribute for testing:

• git checkout restapi_auto_5720
• pip wheel --no-deps ./azure-mgmt-batch

Direct download

Your files can be directly downloaded here:

• azure_mgmt_batch-2019_04_01-py2.py3-none-any.whl
• azure-mgmt-batch-2019-04-01.zip

[AutorestCI]

This PR has been merged into #4781