Fixes https://github.com/hashicorp/nomad/issues/3092

Allow retry of 500 API errors to be handled by restart policies

Handle interfaces that only have link-local addrs

Root permissions are needed for testing certain functionality

Enable autocompletion of flags

Use make release target, remove make bin

This PR changes the fingerprint handling of network interfaces that only
contain link local addresses. The new behavior is to prefer globally
routable addresses and if none are detected, to fall back to link local
addresses if the operator hasn't disallowed it. This gives us pre 0.6
behavior for interfaces with only link local addresses but 0.6+ behavior
for IPv6 interfaces that will always have a link-local address.

Fixes https://github.com/hashicorp/nomad/issues/3005

/cc diptanuc

Detect STDOUT isn't a TTY and disable color

This PR disables color output when the STDOUT is not a TTY. This makes
running commands under `watch` or other commands nicer.

Fix purging job versions

Clean up docker mounts

Clarify deployment api docs

Fix typo Automtic -> Automatic

Autocomplete arguments for remaining commands