generic.test: skip cluster leak warning for lvm

Signed-off-by: NXueqiang Wei <xuwei@redhat.com>

generic/tests/cfg/lvm.cfg

@@ -45,6 +45,9 @@
             sub_type = ioquit
             force_create_image_stg1 = no
             force_create_image_stg2 = no
+            backup_image_before_testing = yes
+            restore_image_after_testing = yes
+            skip_cluster_leak_warn = yes
             background_cmd = "for i in 1 2 3 4; do (dd if=/dev/urandom of=/mnt/kvm_test_lvm/file bs=102400 count=10000000 &); done"
             check_cmd = pgrep dd
         - lvm_clean: lvm_create