Thread through whether DeriveToken error is recoverable or not

Change how we mark tasks as failed and allow consul-template to fail tasks

Output Node meta in verbose mode

Print the version and client node ID

document initial status

Move to container-based build process

Remove disk usage enforcement

Many thanks to @iverberk for the original PR (#1609), but we ended up
not wanting to ship this implementation with 0.5.

We'll come back to it after 0.5 and hopefully find a way to leverage
filesystem accounting and quotas, so we can skip the expensive polling.

Update kubernetes.html.md

Mount the local directory into the Docker container

Vault token renewal errors handled by client

Consul-template signal change mode