[Bug 283256] CLOCK_MONOTONIC in dhclient

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283256

            Bug ID: 283256
           Summary: CLOCK_MONOTONIC in dhclient
           Product: Base System
           Version: 14.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: bag@zurbagan.org

dhclient uses clock_gettime(CLOCK_MONOTONIC...) to track lease validity.
But CLOCK_MONOTONIC doesn't guarantee any relationship with wall clock. For
example clock_monotic starts counting from zero on each reboot of my Freebsd
14.2 in proxmox venv. 

#> cat dhclient.leases.vtnet2 | tail -4
  renew 4 1970/1/1 22:10:57;
  rebind 4 1970/1/1 22:10:52;
  expire 4 1970/1/1 22:11:57;
}


Because of this, saved leases (/var/db/dhclient.leases*) are incorrectly
considered usable as backup after a reboot.

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