Another vgremove for speedup

It seems like test-suite is significantly slowed down on removal phase.

Maybe it should be part of generic teardown - though the reason of slowdown
should be also discovered -  probably related to retry loop ?

test/api/percent.sh

@@ -24,3 +24,5 @@ dd if=/dev/urandom of=$DM_DEV_DIR/$vg/snap2 count=1 bs=1024
 lvcreate -m 1 -n mirr $vg -l 1 --mirrorlog core
 lvs $vg
 aux apitest percent $vg
+
+vgremove -ff $vg