Fix Sqs ErrorType not being parsed properly

[ziyanli-amazon]

Customer reporting exception error type is not properly handled after the AwsJson-1.0 migration when calling SQS.

For example, when calling

import boto3
import botocore

sqs = boto3.client('sqs')

try:
    sqs.delete_queue( QueueUrl='foo-nonexistant-queue' )
except sqs.exceptions.QueueDoesNotExist as e:
    print("Successfully caught QueueDoesNotExist")

Message does not printed, but instead exception dump does.

This is because Client is listening to an ErrorCode to throw a modelled factory exception. In the above case, self.client.exceptions.QueueDoesNotExist ErrorType should be thrown. However, as a prerequisite of the AwsJson migration, we modified the ErrorCode to ensure a backwards compatibility. In the above case, ErrorCode should be AWS.SimpleQueueService.NonExistentQueue.

This PR should fix this.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (01dabf4) 93.46% compared to head (0d6c1fb) 93.46%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3054   +/-   ##
========================================
  Coverage    93.46%   93.46%           
========================================
  Files           66       66           
  Lines        14007    14011    +4     
========================================
+ Hits         13091    13095    +4     
  Misses         916      916           

Files	Coverage Δ
botocore/client.py	97.68% <100.00%> (+<0.01%)	⬆️
botocore/parsers.py	98.62% <100.00%> (+<0.01%)	⬆️

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