config: remove pause_root_path from configuration file
config: remove pause_root_path from configuration file

runtime doesn't need ```pause_root_path``` variable any more,
because of the pause binary was removed by a previous commit

fixes #793

Signed-off-by: Julio Montes <4a43a13347431ef00be7d745d08a5ba1757e840b@intel.com>

devimc/runtime,chavafg/runtime,devimc/runtime,clearcontainers/runtime,clearcontainers/runtime,chavafg/runtime