docker-registry/package.accept_keywords: Update for 20140410 tree
docker-registry/package.accept_keywords: Update for 20140410 tree

Bump a number of versions, and drop the no-longer-needed
dev-python/netaddr and dev-python/prettytable keywords (which both
have stable versions for amd64 now).

wking/dockerfile,ostree/dockerfile,fr34k8/dockerfile