ZTS: Add known exceptions

Add the following test failures to the exception list for FreeBSD
to ensure we notice new unexpected failures.

   pool_checkpoint/checkpoint_big_rewind
   pool_checkpoint/checkpoint_indirect

And the following for Linux.

   zvol/zvol_misc/zvol_misc_snapdev

Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue openzfs#12621
Issue openzfs#12622
Issue openzfs#12623
Closes openzfs#12624

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

@@ -278,6 +278,8 @@ if sys.platform.startswith('freebsd'):
         'delegate/zfs_allow_003_pos': ['FAIL', known_reason],
         'inheritance/inherit_001_pos': ['FAIL', '11829'],
         'resilver/resilver_restart_001': ['FAIL', known_reason],
+        'pool_checkpoint/checkpoint_big_rewind': ['FAIL', '12622'],
+        'pool_checkpoint/checkpoint_indirect': ['FAIL', '12623'],
     })
 elif sys.platform.startswith('linux'):
     maybe.update({
@@ -293,6 +295,7 @@ elif sys.platform.startswith('linux'):
         'mmp/mmp_exported_import': ['FAIL', known_reason],
         'mmp/mmp_inactive_import': ['FAIL', known_reason],
         'snapshot/rollback_003_pos': ['FAIL', known_reason],
+        'zvol/zvol_misc/zvol_misc_snapdev': ['FAIL', '12621'],
     })