* update centec e582 platform drivers and libsai * delete minigraph.xml * remove minigraph * update psuutil.py comments * update device qos config file and clean minigraph
1. _INSTALLS defines the packages to be installed in the image at the build time. 2. _LAZY_INSTALLS defines the packages to be installed in the image at the first run time 3. _DEPENDS defines the packages to at the build dependency of the image