DAOS-VOL

Merge branch 'master' of
https://bitbucket.hdfgroup.org/scm/hdf5vol/daos-vol into
feature/unified_namespace

# Conflicts:
#	src/daos_vol.h
#	src/daos_vol_file.c
#	src/daos_vol_group.c
#	src/daos_vol_map.c