[Bug 217973] devel/kyua: local.kyua.utils.datetime_test.timestamp__subtraction failing non-deterministically after recent upgrade

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217973

            Bug ID: 217973
           Summary: devel/kyua:
                    local.kyua.utils.datetime_test.timestamp__subtraction
                    failing non-deterministically after recent upgrade
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jmmv at FreeBSD.org
          Reporter: ngie at FreeBSD.org
          Assignee: jmmv at FreeBSD.org
             Flags: maintainer-feedback?(jmmv at FreeBSD.org)

This commit seems to have broken the
local.kyua.utils.datetime_test.timestamp__subtraction in a non-deterministic
manner, suggesting that the new test code is potentially racy:

------------------------------------------------------------------------
r436312 | brooks | 2017-03-16 16:12:44 -0700 (Thu, 16 Mar 2017) | 10 lines

Hack around wall clock time going backwards.

As reported in https://github.com/jmmv/kyua/issues/155, the wall clock
time can go backwards resulting in an apparent negative delta. As
a workaround, convert such deltas to 1us. This allows tests to run
successfully in MIPS64 qemu.

Approved by:    jmmv (maintainer)
Sponsored by:   DARPA, AFRL

This test has been largely failing on ci.freebsd.org, as evidenced here:

- Failing example:
https://ci.freebsd.org/job/FreeBSD-head-amd64-test/2289/testReport/local.kyua.utils/datetime_test/timestamp__subtraction/
- Trend/summary:
https://ci.freebsd.org/job/FreeBSD-head-amd64-test/2289/testReport/

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