ZTS: remove verify_slog_support helper

verify_slog_support no longer applies to ZFS since slog support
is always available.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Christian Schwarz <me@cschwarz.com>
Closes #12092

tests/zfs-tests/tests/functional/pool_names/pool_names_002_neg.ksh

@@ -111,9 +111,9 @@ set -A POOLNAME \
     "2222222222222222222" "mirror_pool" "raidz_pool" \
     "mirror-pool" "raidz-pool" "spare" "spare_pool" \
     "spare-pool" "raidz1-" "raidz2:" ":aaa" "-bbb" "_ccc" ".ddd"
-if verify_slog_support ; then
-	POOLNAME[${#POOLNAME[@]}]='log'
-fi
+
+POOLNAME[${#POOLNAME[@]}]='log'
+
 typeset -i i=0
 while ((i < ${#POOLNAME[@]})); do
 	log_mustnot zpool create -m $TESTDIR ${POOLNAME[$i]} $DISK

tests/zfs-tests/tests/functional/slog/cleanup.ksh

@@ -34,10 +34,6 @@
 
 verify_runnable "global"
 
-if ! verify_slog_support ; then
-	log_unsupported "This system doesn't support separate intent logs"
-fi
-
 if datasetexists $TESTPOOL ; then
 	log_must zpool destroy -f $TESTPOOL
 fi

tests/zfs-tests/tests/functional/slog/setup.ksh

@@ -34,8 +34,4 @@
 
 verify_runnable "global"
 
-if ! verify_slog_support ; then
-	log_unsupported "This system doesn't support separate intent logs"
-fi
-
 log_pass