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, 12 insertions, 4 deletions

diff --git a/test/ntypes.c b/test/ntypes.c
index 13cc72a..37a63a4 100644
--- a/test/ntypes.c
+++ b/test/ntypes.c
@@ -3131,11 +3131,19 @@ main(void)
     nerrors += test_enum_dtype(file) < 0 ? 1 : 0;
     nerrors += test_array_dtype(file) < 0 ? 1 : 0;
     nerrors += test_array_dtype2(file) < 0 ? 1 : 0;
-    nerrors += test_vl_dtype(file) < 0 ? 1 : 0;
-    nerrors += test_vlstr_dtype(file) < 0 ? 1 : 0;
+
+    if (!h5_using_parallel_driver(NULL)) {
+        nerrors += test_vl_dtype(file) < 0 ? 1 : 0;
+        nerrors += test_vlstr_dtype(file) < 0 ? 1 : 0;
+    }
+
     nerrors += test_str_dtype(file) < 0 ? 1 : 0;
-    nerrors += test_refer_dtype(file) < 0 ? 1 : 0;
-    nerrors += test_refer_dtype2(file) < 0 ? 1 : 0;
+
+    if (!h5_using_parallel_driver(NULL)) {
+        nerrors += test_refer_dtype(file) < 0 ? 1 : 0;
+        nerrors += test_refer_dtype2(file) < 0 ? 1 : 0;
+    }
+
     nerrors += test_opaque_dtype(file) < 0 ? 1 : 0;
     nerrors += test_bitfield_dtype(file) < 0 ? 1 : 0;
     nerrors += test_ninteger() < 0 ? 1 : 0;