(RAZOR-335) Remove Sid/Unstable from build defaults

This commit goes through the build_defaults.yaml and removes the sid and
unstable entries. Part of the reason for this removal is the lack of
testing the build but still shipping the packages and we already
build against Debian tests.
Query IPMI Details

IPMI details had no way of being queried. This places username and hostname
in the node details, and so can be queried via `razor --full nodes $name`.

Fixes https://tickets.puppetlabs.com/browse/RAZOR-277
Fix spec test
`create-policy` should warn that it cannot create tags

When the user runs an outdated `create-policy` command that was intended to
create a tag, the user sees the unhelpful: `error: tags[0] should be a string,
but was actually a object`. This should instead read: `error: this command can
no longer create tags; see `razor help create-tag``.

Fixes https://tickets.puppetlabs.com/browse/RAZOR-336