[MacPorts] #58668: dns-server: Fix netstat on Catalina

[MacPorts]

#58668: dns-server: Fix netstat on Catalina
-------------------------+-----------------------
  Reporter:  mf2k        |      Owner:  essandess
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  catalina
      Port:  dns-server  |
-------------------------+-----------------------

Comment (by essandess):

 In [changeset:"e71ee76812fdb3680c25fd5d2f09f710486cecc1/macports-ports"
 e71ee76812fdb3680c25fd5d2f09f710486cecc1/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="e71ee76812fdb3680c25fd5d2f09f710486cecc1"
 dns-server: Add hard-coded network settings to address portindex issue

 * Use default hard-coded example configuration settings
 * Put network settings in `post-activate` block as recommended
 * Use `awks`'s `$NF` to get default interfaces
 * Resolves: https://trac.macports.org/ticket/58668
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58668#comment:5>
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