ZTS: zvol_misc_volmode is flaky on FreeBSD

Mark this as a known issue.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10655

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

@@ -253,6 +253,7 @@ if sys.platform.startswith('freebsd'):
         'removal/removal_condense_export': ['FAIL', known_reason],
         'removal/removal_with_export': ['FAIL', known_reason],
         'resilver/resilver_restart_001': ['FAIL', known_reason],
+        'zvol/zvol_misc/zvol_misc_volmode': ['FAIL', known_reason],
     })
 elif sys.platform.startswith('linux'):
     maybe.update({