Cgroup CHECK fails test harness

CHECK in clean up of ContainerizerTest causes test harness to abort rather than fail or skip only perf related tests.

[ RUN ] SlaveRecoveryTest/0.RestartBeforeContainerizerLaunch
[ OK ] SlaveRecoveryTest/0.RestartBeforeContainerizerLaunch (628 ms)
[----------] 24 tests from SlaveRecoveryTest/0 (38986 ms total)

[----------] 4 tests from MesosContainerizerSlaveRecoveryTest
[ RUN ] MesosContainerizerSlaveRecoveryTest.ResourceStatistics
../../src/tests/mesos.cpp:720: Failure
cgroups::mount(hierarchy, subsystem): 'perf_event' is already attached to another hierarchy
-------------------------------------------------------------
We cannot run any cgroups tests that require
a hierarchy with subsystem 'perf_event'
because we failed to find an existing hierarchy
or create a new one (tried '/tmp/mesos_test_cgroup/perf_event').
You can either remove all existing
hierarchies, or disable this test case
(i.e., --gtest_filter=-MesosContainerizerSlaveRecoveryTest.*).
-------------------------------------------------------------
F0811 17:23:43.874696 12955 mesos.cpp:774] CHECK_SOME(cgroups): '/tmp/mesos_test_cgroup/perf_event' is not a valid hierarchy

• • • Check failure stack trace: ***
      @ 0x7fb2fb4835fd google::LogMessage::Fail()
      @ 0x7fb2fb48543d google::LogMessage::SendToLog()
      @ 0x7fb2fb4831ec google::LogMessage::Flush()
      @ 0x7fb2fb485d39 google::LogMessageFatal::~LogMessageFatal()
      @ 0x4e3f98 _CheckFatal::~_CheckFatal()
      @ 0x82f25a mesos::internal::tests::ContainerizerTest<>::TearDown()
      @ 0xc030e3 testing::internal::HandleExceptionsInMethodIfSupported<>()
      @ 0xbf9050 testing::Test::Run()
      @ 0xbf912e testing::TestInfo::Run()
      @ 0xbf9235 testing::TestCase::Run()
      @ 0xbf94e8 testing::internal::UnitTestImpl::RunAllTests()
      @ 0xbf97a4 testing::UnitTest::Run()
      @ 0x4a9df3 main
      @ 0x7fb2f9371ec5 (unknown)
      @ 0x4b63ee (unknown)
      Build step 'Execute shell' marked build as failure