add seccomp type
add seccomp type

Signed-off-by: Jessica Frazelle <e0d1a862d8f31af605ecef8c92857b8938ba622e@docker.com>

thaJeztah/engine-api,jwhonce/engine-api,vdemeester/engine-api,docker/engine-api,msabansal/engine-api,mikedougherty/engine-api,rhatdan/engine-api