VFD plugins (#602)

* Implement support for loading of Virtual File Drivers as plugins

Fix plugin caching for VOL connector and VFD plugins

Fix plugin iteration to skip paths that can't be opened

* Enable dynamic loading of VFDs with HDF5_DRIVER environment variable

* Temporarily disable error reporting during H5F_open double file open

* Default to using HDstat in h5_get_file_size for unknown VFDs

* Use macros for some environment variables that HDF5 interprets

* Update "null" and "ctl testing" VFDs

1 files changed, 1 insertions, 0 deletions

diff --git a/bin/trace b/bin/trace
index cc26f86..55ce7d4 100755
--- a/bin/trace
+++ b/bin/trace
@@ -53,6 +53,7 @@ $Source = "";
                "H5D_scatter_func_t"         => "DS",
                "H5FD_mpio_xfer_t"           => "Dt",
                "H5D_vds_view_t"             => "Dv",
+               "H5FD_class_value_t"         => "DV",
                "H5D_chunk_iter_op_t"        => "x",
                "herr_t"                     => "e",
                "H5E_auto1_t"                => "Ea",