[Bug 218450] sysutils/tarsnap-periodic: periodic script needs anticongestion sleep

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218450

            Bug ID: 218450
           Summary: sysutils/tarsnap-periodic: periodic script needs
                    anticongestion sleep
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org
                CC: kamila at ksp.sk
                CC: kamila at ksp.sk
             Flags: maintainer-feedback?(kamila at ksp.sk)

Periodic scripts that hit external servers can cause a "thundering herd"
problem, whereby many systems' periodic scripts run at the same time, and
overload the server.  To prevent this, such scripts should sleep for a random
amount of time before hitting the external server.

After r316432, there is a common anticongestion function to handle this.  For
an example of how to use it, see
https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181374&action=diff

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