[EventHubs] Update extensions.__init__.py in EventHubs and EHCheckpointstoreblob to the right nspkg format#13773

yunhaoling merged 1 commit intoAzure:masterAzure/azure-sdk-for-python:masterfrom

yunhaoling:eh-namespace-adjustyunhaoling/azure-sdk-for-python:eh-namespace-adjustCopy head branch name to clipboard