ZTS: Improve cleanup in removal_with_export

Kill the removal operation on every platform, not just Linux.
The test has been fixed and is now stable on FreeBSD.

Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11856

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

@@ -263,7 +263,6 @@ if sys.platform.startswith('freebsd'):
         'inheritance/inherit_001_pos': ['FAIL', '11829'],
         'pool_checkpoint/checkpoint_zhack_feat': ['FAIL', '11854'],
         '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],
     })

tests/zfs-tests/tests/functional/removal/removal_with_export.ksh

@@ -26,7 +26,7 @@ log_onexit default_cleanup_noexit
 
 function callback
 {
-	is_linux && test_removal_with_operation_kill
+	test_removal_with_operation_kill
 	log_must zpool export $TESTPOOL
 
 	#