test: attempt to reduce failures in assert_cpu_usage_low

Try to make this test less fragile by taking into account
the worst case kernel timing resolution.
[ruby-core:81540]

* test/lib/test/unit/assertions.rb (assert_cpu_usage_low):
  clamp measurement to minimum measurable time and warn
  about tests being too short to measure
* test/ruby/test_io.rb (test_copy_stream_no_busy_wait):
  remove pct kwarg and rely on assert_cpu_usage_low defaults

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59003 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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