[PATCH] DNS dlz_bind9 reference count logging

[Aaron Haslett]

dlz_bind9 has to count the number of times the plugin is 'created' by
bind's plugin manager so it doesn't repeat setup.  Logging doesn't
reflect this reference counting logic properly and so messages like
"samba_dlz: shutdown" can, confusingly, come up when the database
connection has not actually been severed.  This patch adds the necessary
logging.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13655

CI: https://gitlab.com/catalyst-samba/samba/pipelines/32943606

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