pkg: Add OCI utils package
pkg: Add OCI utils package

Mostly for translating an OCI configuration file into
a virtcontainers pod configuration.

Signed-off-by: Samuel Ortiz <0ba86cb3f08bbb861958e54bd3438887adb4263c@linux.intel.com>

containers/virtcontainers,wcwxyz/virtcontainers,wcwxyz/virtcontainers,wcwxyz/virtcontainers,containers/virtcontainers