udev: ignore private LVM devs in udev and systemd

We automatically ignore these devs, when lvm2 create devs,
whoever when lvm2 database is dropped or someone just
created these devs with such formated UUID, there is no
other informantion then to check DM UUID.

udev/11-dm-lvm.rules.in

@@ -34,6 +34,9 @@ ENV{DM_SUBSYSTEM_UDEV_FLAG0}=="1", ENV{.DM_NOSCAN}="1", ENV{DM_UDEV_DISABLE_OTHE
 
 ENV{DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG}=="1", GOTO="lvm_end"
 
+# Ignore private devices - the ones having any suffix in DM_UUID. Both in udev rules and in systemd.
+ENV{DM_UUID}=="LVM-?*-?*", ENV{SYSTEMD_READY}="0", GOTO="lvm_disable"
+
 # Do not create symlinks for inappropriate subdevices.
 ENV{DM_LV_NAME}=="pvmove?*|?*_vorigin", GOTO="lvm_disable"
 ENV{DM_LV_LAYER}=="?*", GOTO="lvm_disable"