feat(registry): image without development libraries to reduce the size.
fix(controller): include message to avoid confusion building the component
fix(deisctl): control plane components should restart on failure
test(tests): add config:unset tests
ref(docs): rewrite coding standards doc as a PR checklist

The "coding standards" document needed an update for go, our
most prevalent implementation language. It was also verbose and
a bit rambling as it had grown over time, so this attempts
to condense and focus it as a simpler checklist to follow.
Merge pull request #2125 from gabrtv/restart-policy

fix(deisctl): control plane components should restart on failure
Merge pull request #2119 from mboersma/update-code-standards

ref(docs): rewrite coding standards doc as a PR checklist
Merge pull request #2102 from aledbf/reduce_controller_size

feat(controller): image without development libraries to reduce the size.
Merge pull request #2128 from bacongobbler/2085_unset_tests

test(tests): add config:unset tests