Exclude zfs_copies_003_pos on Linux

This test case may fail on 5.13 and newer Linux kernels if the
/dev/zvol/ device is not created by udev.

Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue openzfs#12301
Closes  openzfs#12738

tests/test-runner/bin/zts-report.py.in

@@ -284,6 +284,7 @@ elif sys.platform.startswith('linux'):
         'alloc_class/alloc_class_011_neg': ['FAIL', known_reason],
         'alloc_class/alloc_class_012_pos': ['FAIL', known_reason],
         'alloc_class/alloc_class_013_pos': ['FAIL', '11888'],
+        'cli_root/zfs_copies/zfs_copies_003_pos': ['FAIL', '12301'],
         'cli_root/zfs_rename/zfs_rename_002_pos': ['FAIL', known_reason],
         'cli_root/zpool_expand/zpool_expand_001_pos': ['FAIL', known_reason],
         'cli_root/zpool_expand/zpool_expand_005_pos': ['FAIL', known_reason],