vchoi_fork

[svn-r12396] Purpose:
Bug fix.

Description:
Sometimes the parallel prefix is given in the form of nfs:/mnt/pfs which
if given to a non-MPIO VFD like the default H5Fcreate, it would fail.
Called h5_rmprefix which would return the non-prefix component
part of the file name which would be okay for the default H5Fcreate and
such.

Platforms tested:
Tested in heping parallel.