update to runtime-spec v1.0.0-rc2

[cyphar]

Currently validation fails against v1.0.0-rc2 images, which is causing issues for adding oci-runtime-tools-based testing for umoci (cyphar/umoci#12).

The current error is just for kernelTCP, which was fixed in the new version of the spec. The only really annoying part of the update is that you need to handle the namespacing of all of the Go structs (where everything has Linux prepended to it now).

# oci-runtime-tool validate --path /tmp/bundle.a (status=1)
# time="2016-11-12T16:04:09Z" level=fatal msg="2 Errors detected:\n'Memory.KernelTCP' should not be empty.\ninternal error: validate currently only handles version 1.0.0-rc1-dev, but the supplied configuration targets 1.0.0-rc2"

[liangchenye]

close, already updated to rc5.