aws-mfa doesn't work for China

[shantanugupta]

Upon debugging the issue, if we are not passing region explicitly - enpoint URL gets resolved for global.
#endpoint_url = 'https://sts.cn-north-1.amazonaws.com.cn'
region_name = 'cn-north-1'

If we provide region_name in boto3, it was able to resolve the url. So region_name should be provided by the dev explicitly or region should be pulled from profile before hitting sts request.

client = boto3.client(
'sts',
aws_access_key_id=lt_key_id,
aws_secret_access_key=lt_access_key,
#endpoint_url = 'https://sts.cn-north-1.amazonaws.com.cn'
region_name = 'cn-north-1'
)

[shantanugupta]

Upon debugging the issue, if we are not passing region explicitly - enpoint URL gets resolved for global. #endpoint_url = 'https://sts.cn-north-1.amazonaws.com.cn' region_name = 'cn-north-1'

If we provide region_name in boto3, it was able to resolve the url. So region_name should be provided by the dev explicitly or region should be pulled from profile before hitting sts request.

client = boto3.client( 'sts', aws_access_key_id=lt_key_id, aws_secret_access_key=lt_access_key, #endpoint_url = 'https://sts.cn-north-1.amazonaws.com.cn' region_name = 'cn-north-1' )

Added a pull request to resolve this - #77