[PATCH] loadparm: check for VFS modules required by AD DC role

[David Disseldorp]

When Samba is running as an AD compatible domain controller and the
"vfs objects" parameter is not set, then the dfs_samba4 and acl_xattr
modules are automatically enabled. However, if the "vfs objects" is
defined, then the setting is left as-is.
This means that attempts to us other VFS modules have the side effect of
disabling the dfs_samba4 and acl_xattr modules, causing unexpected
behaviour.

This change ensures that when running as a domain controller, Samba logs
an error if the required VFS modules are not enabled by an explicit
"vfs objects" definition.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=10560

Cheers, David
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