hdf5

Merge pull request #2632 in HDFFV/hdf5 from remove_redundant_chunk_tags to develop

* commit '9e8899c3b47a2041242dc4539ca8b1c5e151a371':
  Remove redundant metadata cache tagging from some low-level internal chunk functions.  The metadata cache tagging has already been done by routines further up the call stack.