[Plugin] Collect plugin service status by default

By default, plugins will now capture service status information from the
init system for any services defined in the plugin's `services` member,
provided that that service actually exists on the system.

This is done by calling a new method, `add_default_collections()` before
we call `Plugin.setup()` for each plugin. This will allow us to more
easily extend default collection behaviors going forward.

Resolves: #1965

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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