[MacPorts] #43006: bind9 portfile improvements

[MacPorts]

#43006: bind9 portfile improvements
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 Reporter:  jul_bsd@…    |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.1
 Keywords:  haspatch     |       Port:  bind9
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 * create and use dedicated user
 * include in notes a reminder to generate rdnc key for administration
 * url for documentation to secure bind
 * livecheck

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Ticket URL: <https://trac.macports.org/ticket/43006>
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