This commit adjusts the tasks in the *samba-dc* role to use a
conditional include to restrict tasks relating to the BIND9_DLZ plugin
only to hosts that are configured to use it.
The *bind-utils* package contains `dig` and `nsupdate`, which are used
to query and manage DNS records.
The *cyrus-sasl-gssapi* package contains the GSSAPI plugin for
SASL-aware applications, including `ldapsearch`.
The *ldb-tools* package contains `ldbsearch` and other tools for
directly using Samba database files.
The `/var/lib/samba/bind-dns` directory contains files that are
hard-linked to files in the `/var/lib/samba/private` directory. All
paths for a file must have the same context, or `restorecon` will
effectively "toggle" the labels each time it is run.
The *samba-dc* role installs Samba on the managed node and configures it
as an Active Directory Domain controller. A custom module,
`samba_domain` handles the provisioning using `samba-tool domain
provision` in an idempotent way.
Dustin