ZTS: Restore some delays in online_offline tests

After more CI runs and code reading after #17259 I've found that
online starts resilver via async mechanism, which does not provide
wait primitives at this time.  Restore some delays to restore CI
until this is properly fixed.

Signed-off-by:	Alexander Motin <[email protected]>
Sponsored by:	iXsystems, Inc.

Author: amotin

tests/zfs-tests/tests/functional/online_offline/online_offline_001_pos.ksh

@@ -59,6 +59,7 @@ function cleanup
 		log_must zpool online $TESTPOOL $disk
 		log_must check_state $TESTPOOL $disk "online"
 	done
+	sleep 1 # Delay for resilver to start
 	log_must zpool wait -t resilver $TESTPOOL
 
 	[[ -e $TESTDIR ]] && log_must rm -rf $TESTDIR/*
@@ -77,7 +78,7 @@ for disk in $DISKLIST; do
 
 	log_must zpool online $TESTPOOL $disk
 	log_must check_state $TESTPOOL $disk "online"
-
+	sleep 1 # Delay for resilver to start
 	log_must zpool wait -t resilver $TESTPOOL
 done
 

tests/zfs-tests/tests/functional/online_offline/online_offline_002_neg.ksh

@@ -60,6 +60,7 @@ function cleanup
 		log_must zpool online $TESTPOOL $disk
 		log_must check_state $TESTPOOL $disk "online"
 	done
+	sleep 1 # Delay for resilver to start
 	log_must zpool wait -t resilver $TESTPOOL
 
 	[[ -e $TESTDIR ]] && log_must rm -rf $TESTDIR/*
@@ -89,6 +90,7 @@ while [[ $i -lt ${#disks[*]} ]]; do
 		log_must zpool online $TESTPOOL ${disks[$i]}
 		check_state $TESTPOOL ${disks[$i]} "online" || \
 		    log_fail "Failed to set ${disks[$i]} online"
+		sleep 1 # Delay for resilver to start
 		log_must zpool wait -t resilver $TESTPOOL
 		log_must zpool clear $TESTPOOL
 		while [[ $j -lt ${#disks[*]} ]]; do
@@ -121,6 +123,7 @@ while [[ $i -lt ${#disks[*]} ]]; do
 		log_must zpool online $TESTPOOL ${disks[$i]}
 		check_state $TESTPOOL ${disks[$i]} "online" || \
 		    log_fail "Failed to set ${disks[$i]} online"
+		sleep 1 # Delay for resilver to start
 		log_must zpool wait -t resilver $TESTPOOL
 		log_must zpool clear $TESTPOOL
 	fi