* [docker-config-engine]: introduce docker sonic config engine
sonic config engine provide the sonic configure engine for all sonic
dockers that rely on the engine to generate runtime configuration.
* Cavium support in the new build infrastructure
* Added a file with a list of cavium debian packages
* docker-syncd-cavm : Added SAI and XDK libraries
* docker-syncd-cavm : Removed redis-tools from docker template
