fix(IoT): fixing race condition in AWSIoTStreamThread .cxx_destruct … #628

Job	Run time
Unit Test (AWSAPIGateway)	4m 9s
Unit Test (AWSAutoScaling)	4m 12s
Unit Test (AWSCloudWatch)	7m 28s
Unit Test (AWSCognitoAuth)	4m 54s
Unit Test (AWSCognitoIdentityProvider)	5m 19s
Unit Test (AWSComprehend)	5m 23s
Unit Test (AWSConnect)	6m 29s
Unit Test (AWSConnectParticipant)	6m 10s
Unit Test (AWSCore)	9m 28s
Unit Test (AWSDynamoDB)	5m 32s
Unit Test (AWSEC2)	7m 24s
Unit Test (AWSElasticLoadBalancing)	6m 32s
Unit Test (AWSIoT)	9m 29s
Unit Test (AWSKMS)	4m 19s
Unit Test (AWSKinesis)	3m 49s
Unit Test (AWSKinesisVideo)	4m 42s
Unit Test (AWSKinesisVideoArchivedMedia)	6m 35s
Unit Test (AWSKinesisVideoSignaling)	7m 12s
Unit Test (AWSKinesisVideoWebRTCStorage)	5m 15s
Unit Test (AWSLambda)	3m 26s
Unit Test (AWSLex)	5m 37s
Unit Test (AWSLogs)	3m 58s
Unit Test (AWSMachineLearning)	3m 0s
Unit Test (AWSMobileClient)	5m 1s
Unit Test (AWSPinpoint)	4m 12s
Unit Test (AWSPolly)	3m 44s
Unit Test (AWSRekognition)	4m 38s
Unit Test (AWSS3)	6m 26s
Unit Test (AWSSES)	6m 25s
Unit Test (AWSSNS)	2m 44s
Unit Test (AWSSQS)	6m 33s
Unit Test (AWSSageMakerRuntime)	4m 14s
Unit Test (AWSSimpleDB)	3m 45s
Unit Test (AWSTextract)	5m 19s
Unit Test (AWSTranscribe)	7m 32s
Unit Test (AWSTranscribeStreaming)	6m 46s
Unit Test (AWSTranslate)	4m 25s
Unit Test (AWSLocation)	6m 52s
Unit Test (AWSChimeSDKMessaging)	3m 6s
Unit Test (AWSChimeSDKIdentity)	6m 3s
	3h 38m 7s

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