Improve VM stop reliability (#304)

tests/vm

@@ -21,16 +21,17 @@ if ! echo "${LXD_SNAP_CHANNEL}" | grep -qE '^4\.0/'; then
     lxc start vm1
     waitInstanceBooted vm1
 
-    # Try disconnecting a VM stopping forcefully and gracefully to make sure they match.
-    (sleep 1 && lxc stop -f vm1) &
-    lxc exec vm1 -- sleep 10 || exitCode=$?
+    echo "==> Test lxc exec exit code when stopping the VM cleanly"
+    (sleep 5 && lxc stop vm1) &
+    lxc exec vm1 -- sleep 60 || exitCode=$?
     [ "${exitCode:-0}" -eq 129 ]
-
     wait $!
+
+    echo "==> Test lxc exec exit code when stopping the VM abruptly"
     lxc start vm1
     waitInstanceBooted vm1
-    (sleep 1 && lxc stop vm1) &
-    lxc exec vm1 -- sleep 10 || exitCode=$?
+    (sleep 5 && lxc stop -f vm1) &
+    lxc exec vm1 -- sleep 60 || exitCode=$?
     [ "${exitCode:-0}" -eq 129 ]
     wait $!
 fi