OSF: Don't forget to set NUMA node nodeset

Looks like nobody ever tried to play with memory binding on OSF/Tru64.
x86: Don't forget to set NUMA node nodeset

Not critical since BSDs that use this backend have no membind support,
but better fix it for uniformization.
debug: check that PU and NUMA nodes have proper cpuset/nodeset
debug: check that child cannot have cpuset if parent doesn't

Assumption valid since custom is gone.
tests: pass HWLOC_DEBUG_CHECK=1 to all test scripts

We only passed it in Linux test topologies before this commit.

May be slightly slower.