main: coredump on internal error
main: coredump on internal error

Override the default golang panic handling by printing a full traceback
(not just for the current goroutine) and coredumping to allow
crash-handling programs like apport to log the details.

Fixes #688.

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

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