test_min_time_to_next_builder fails spuriously

This test fails on one machine, but not another. It's clearly a timing issue. I will disable it in an upcoming landing.

Failure in test test_min_time_to_next_builder (lp.buildmaster.tests.test_buildqu
eue.TestMinTimeToNextBuilderMulti)
Traceback (most recent call last):
_StringException: Text attachment: traceback
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Traceback (most recent call last):
  File "/home/abentley/launchpad/stable/eggs/testtools-0.9.2-py2.5.egg/testtools
/runtest.py", line 128, in _run_user
    return fn(*args)
  File "/home/abentley/launchpad/stable/eggs/testtools-0.9.2-py2.5.egg/testtools
/testcase.py", line 368, in _run_test_method
    testMethod()
  File "/home/abentley/launchpad/deleted-proposal/lib/lp/buildmaster/tests/test_buildqueue.py", line 803, in test_min_time_to_next_builder
    check_mintime_to_builder(self, apg_job, 29)
  File "/home/abentley/launchpad/deleted-proposal/lib/lp/buildmaster/tests/test_buildqueue.py", line 110, in check_mintime_to_builder
    % (delay, min_time))
  File "/usr/lib/python2.5/unittest.py", line 309, in failUnless
    if not expr: raise self.failureException, msg
AssertionError: Wrong min time to next available builder (30 > 29)
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