Commits on Aug 1, 2019

1. agent: add support for loading kernel modules …

   Some containers may require HW devices to improve its performance. In Kata
   containers these devices can be passed though VFIO and used in the container
   only if the guest kernel has the drivers built-in for them. When kernel
   fragment support landed (kata-containers/packaging#646), kata lost support
   for several HW devices like Intel GPUs, this was expected since one of the
   goals of this change was to have a minimal kernel in order to improve boot
   time, memory footprint and reduce the attack surface by enabling just the
   features required to run kata containers.
   Currently if the users want to use a HW device in kata container, He/She has
   to build a custom kernel and create a custom image that includes the modules
   that will be loaded by systemd. From user's perspective this is a pain, since
   not all users know how to create a custom image or configure/build a custom
   kernel.
   Same as the `debug_console` feature (kata-containers#547), the goal of
   this change is to facilitate the things to the final user and *do not* depend
   on systemd.
   The list of kernel modules and their parameters are set through gRPC when the
   sandbox is created.
   
   fixes kata-containers#615
   
   see kata-containers/osbuilder#77
   
   Signed-off-by: Julio Montes <julio.montes@intel.com>

   Julio Montes committed Aug 1, 2019
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