Skip the unittest on kFreeBSD and Hurd
Skip the unittest on kFreeBSD and Hurd

Locking seems to be N/A:

* on kfreebsd /dev/shm is N/A
* on Hurd -- inter-process semaphore locking is N/A

Thanks to Yaroslav Halchenko

andreabedini/PyTables,gdementen/PyTables,tp199911/PyTables,dotsdl/PyTables,andreabedini/PyTables,FrancescAlted/PyTables,tp199911/PyTables,joonro/PyTables,rabernat/PyTables,cpcloud/PyTables,jack-pappas/PyTables,joonro/PyTables,FrancescAlted/PyTables,FrancescAlted/PyTables,cpcloud/PyTables,mohamed-ali/PyTables,jennolsen84/PyTables,rdhyee/PyTables,jack-pappas/PyTables,mohamed-ali/PyTables,mohamed-ali/PyTables,PyTables/PyTables,mohamed-ali/PyTables,PyTables/PyTables,dotsdl/PyTables,rdhyee/PyTables,cpcloud/PyTables,tp199911/PyTables,rabernat/PyTables,gdementen/PyTables,jennolsen84/PyTables,joonro/PyTables,rabernat/PyTables,PyTables/PyTables,jack-pappas/PyTables,jack-pappas/PyTables,jennolsen84/PyTables,andreabedini/PyTables,gdementen/PyTables,dotsdl/PyTables,joonro/PyTables,cpcloud/PyTables,tp199911/PyTables,jennolsen84/PyTables,avalentino/PyTables,andreabedini/PyTables,jack-pappas/PyTables,rabernat/PyTables,gdementen/PyTables,avalentino/PyTables,rdhyee/PyTables,rdhyee/PyTables,avalentino/PyTables,dotsdl/PyTables