New test failures with latest LGB

[jamesETsmith]

Summary

New failures with the latest version of LGB (e23a5bf). @moonwatcher and I both see these failures for x86 and LC builds running on a single node in the simulator. As far as I can tell these are not LC crashes.

LC build failures:

89% tests passed, 4 tests failed out of 36

Total Test time (real) = 467.15 sec

The following tests FAILED:
          1 - ctest_Betweenness (Failed)
          2 - ctest_BreadthFirstSearch (Failed)
          8 - ctest_ConnectedComponents (Failed)
         23 - ctest_SingleSourceShortestPath (Failed)

x86 failures:

92% tests passed, 3 tests failed out of 36

Total Test time (real) =   0.14 sec

The following tests FAILED:
          2 - ctest_BreadthFirstSearch (Failed)
          8 - ctest_ConnectedComponents (Failed)
         23 - ctest_SingleSourceShortestPath (Failed)