Support querying codecommit of partition 'aws-cn' in session

[zxkane]

AWS CodeCommit is GA in AWS China(for both cn-north-1 and cn-northwest-1).

Above regions are not available when querying regions for service 'codecommit' for 'aws-cn'.

>>> import botocore.session
>>> session = botocore.session.Session(profile = 'default')
>>> session.get_available_partitions()
['aws', 'aws-cn', 'aws-us-gov']
>>> session.get_available_regions('codecommit', 'aws-cn')
[]
>>> session.get_available_regions('codecommit', 'aws')
['ap-northeast-1', 'ap-northeast-2', 'ap-south-1', 'ap-southeast-1', 'ap-southeast-2', 'ca-central-1', 'eu-central-1', 'eu-west-1', 'eu-west-2', 'eu-west-3', 'sa-east-1', 'us-east-1', 'us-east-2', 'us-west-1', 'us-west-2']

[swetashre]

@zxkane - Thank you for your post. This change was introduced yesterday here:
https://www.amazonaws.cn/en/new/2020/aws-codecommit-available-aws-china-beijing-sinnet-ningxia-nwcd/

As this is recent change, those region has not included in the endpoints.json file. The endpoints.json file comes from upstream. So the service team will eventually include those regions as they are available now. I think it only matters of time.

[no-response]

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