[MacPorts] #59848: Avahi-daemon fails to start on catalina

[MacPorts]

#59848: Avahi-daemon fails to start on catalina
--------------------------------+--------------------
 Reporter:  hpux735             |      Owner:  (none)
     Type:  defect              |     Status:  new
 Priority:  Normal              |  Milestone:
Component:  ports               |    Version:  2.6.1
 Keywords:  avahi avahi-daemon  |       Port:  avahi
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 It appears as though avahi-daemon wants to create a directory at `/run
 /avahi-daemon` when it starts.  On catalina, `/` is now read-only, and
 this fails.

 It seems like there isn't a way to change the path that avahi wants to
 create this directory from the command line.  I suspect that it'll have to
 be changed when the package is compiled.

 I tested the same port in Mojave, and it doesn't hit this problem.

 Finally, there are a few obsolete keys in the launchd plist that need to
 be updated.

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Ticket URL: <https://trac.macports.org/ticket/59848>
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