bectl(8) tests: attempt to load the ZFS module

Observed in a CI test image, bectl_create test will run and be marked as
skipped because the module is not loaded. The first zpool invocation will
automagically load the module, but bectl_create is still skipped. Subsequent
tests all pass as expected because the module is now loaded and everything
is OK.

MFC after:	3 days

sbin/bectl/tests/bectl_test.sh

@@ -34,7 +34,7 @@ bectl_create_setup()
 	disk=$2
 	mnt=$3
 
-	kldstat -qm zfs || atf_skip "ZFS module not loaded on the current system"
+	kldload -n -q zfs || atf_skip "ZFS module not loaded on the current system"
 	atf_check mkdir -p ${mnt}
 	atf_check truncate -s 1G ${disk}
 	atf_check zpool create -o altroot=${mnt} ${zpool} ${disk}