On FreeBSD skip test that produces bogus output

The test produces lines that start with "<word>: " which confuses the
buildbot log parser.  Disable the test until either the test is fixed
or the buildbot can deal with the undesired output.

llvm.org/pr20545


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@214900 91177308-0d34-0410-b5e6-96231b3b80d8