Comment out iexhub references to allow 'docker-compose up'
Comment out iexhub references to allow 'docker-compose up'

Details: Comment out iexhub references in docker-compose.yml file so that developers can start all MHC apps using command 'docker-compose up'. Since iexhub isn't yet dockerized, having it in the docker-compose.yml file causes the whole process to exit with an error

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