Docker build fails with Clear Containers as default

[jcvenegas]

When using osbuilder and docker use cc-oci-runtime as default runtime, it breaks with a segfault issue caused by qemu.

To workaround this it is need to use runc as default runtime (docker does not give an option to use change a runtime using docker build command)

The issue https://github.com/01org/cc-oci-runtime/issues/669 need to be fixed to work correctly with cc-oci-runtime as default runtime.