logging: Add path to config file
logging: Add path to config file

Log the full path to the configuration file being used by the runtime
as a debug aide.

Fixes #357.

Signed-off-by: James O. D. Hunt <348fbaadfbada55ea105602bf5609e23ac1c4898@intel.com>

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