When overriding local node name (using NODENAME environment variable),
clustering does not work as tinit_node is tested again hostname or
fqdn. By adding the optional local_node to specify which node is the
current node we can fix this issue.

Use case: a server with a public and a private interface, rabbitmq
cluster nodes communicates through the private interface while hostname
and fqdn resolves to the public interface (and that can't be changed
because of other dependencies on the server). The only solution is to
use dedictated name for the private interface.

cluster: add local_node settings

This fixes inconsistent logic to determine management ip address if
the rabbitmq::management_ip_address parameter is not set, and makes
sure all logic tries to look up the rabbitmq::node_ip_address
parameter.

Fix detection of management_ip_address for rabbitmqadmin

Drop Puppet 6 support

PR #927 removed Puppet 6 support, so we should be safely able to remove
these testing workarounds

Remove testing workarounds from Puppet < 6

- Deprecate Debian 9 and Ubuntu 16.04
- Add support for Debian 10
- Remove RABBITMQ_USE_LONGNAME in clustering acceptance tests
  Acceptance tests fail on instance without a FQDN when
  `RABBITMQ_USE_LONGNAME` is set to `true` in the environment.
  Simplify the test case; this still seems to work on older and newer
  supported versions

Signed-off-by: William Yardley <wyardley@users.noreply.github.com>

Rabbitmq_plugin now correctly detects implicitly enabled plugins to
preserve idempotency regardless of plugin install order

Cherry-picked from #844
Fixes #930

Signed-off-by: William Yardley <wyardley@users.noreply.github.com>

Remove support for Debian 9 and Ubuntu 16.04; Add Debian 10 support

- Increase minimum stdlib to 4.25.0
- Remove `Stdlib::Compat` for `Stdlib::IP::Address::V6::Nosubnet`

https://forge.puppet.com/modules/puppetlabs/stdlib/readme

Remove deprecated `Stdlib::Compat`

Update tests and metadata to support FreeBSD 12 and 13
This also helps us unit test the (otherwise untested) conditionals
related to systems without systemd

We may still need to tweak the current python package name, but this is
a start

Per @bastelfreak's suggestion, use os_facts to avoid confusion with
:facts

Signed-off-by: William Yardley <wyardley@users.noreply.github.com>

Support FreeBSD 12 and 13

Drop official metadata.json support for Archlinux until the acceptance
tests can be fixed

Replace legacy :osfacts with facts[:os]['family']

Signed-off-by: William Yardley <wyardley@users.noreply.github.com>

BREAKING: Drop official Archlinux support

Release 13.0.0