Wrong region name parsing for AWS China

[LLluma]

Describe the bug
For AWS China region base domain is slightly different than for the rest world. It is amazon.com.cn.
Currently AWS domain is hard coded in the sqs.go. Would be nice if that will be configured parameter.

To Reproduce
Deploy service to the China AWS region and use SQS subscription

Expected behavior

• probeSQS should returns true if it is passed https://sqs.cn-northwest-1.amazonaws.com.cn/123456789/myqueue
• sqsRegionFromPlainURL should return cn-northwest-1 if it is passed https://sqs.cn-northwest-1.amazonaws.com.cn/123456789/myqueue

I prepared minor changes which is fixing this problem: #702