hdf5_msb

Commented out some test code that resulted spurious failures
in un-related tests (i.e. earray, fheap, etc.).

On jelly and charis, vfd_swmr now passes.

testvfdswmr.sh displas the following failures:

1) occasionally ccan't open the metadata file.  This shows
   up more on jelly than charis.

2) occasional complaints about incorrect raw data

3) occasional complaints from Quincey's evict tagged
   entries code that it can't evict all the tagged entries.

4) Numerous filter failures.  At a guess, this is an artifact of
   raw data not making it to file in sync with the metadata.
   I didn't see this on charis, as I don't have compression
   configured.

5) An assertion failure in the page buffer in which a sanity check
    is failing in the code to update the replacement policy.

    This is worrying --- I'll need to look into it on my return.