Fixed writing of udev rule in AY's second stage. bnc#956605

src/modules/LanItems.rb

@@ -55,6 +55,7 @@ def main
       Yast.import "NetworkConfig"
       Yast.import "NetworkStorage"
       Yast.import "Storage"
+      Yast.import "Stage"
       Yast.include self, "network/complex.rb"
       Yast.include self, "network/routines.rb"
       Yast.include self, "network/lan/s390.rb"
@@ -739,7 +740,16 @@ def write
         SetItemName(item_id, renamed_to(item_id))
       end
 
-      LanItems.WriteUdevRules if LanUdevAuto.AllowUdevModify
+      # FIXME: in case of AY, writing udev rules was partly moved into first stage
+      # (bnc#955217). However, it is so only in case of ssh / vnc installation.
+      # Otherwise, udev rules are written in second stage in *LanUdevAuto* module
+      # and it breaks consistency of data stored in Items. So, moving writing
+      # udev rules into first stage should be completed ASAP even fo non-ssh / vnc
+      # AY installations and LanUdevAuto module should be dropped.
+      # When refactored at least these use cases need to be retested:
+      # - bnc#955217
+      # - bnc#956605
+      LanItems.WriteUdevRules if !Stage.cont && LanUdevAuto.AllowUdevModify
 
       # FIXME: hack: no "netcard" filter as biosdevname names it diferently (bnc#712232)
       NetworkInterfaces.Write("")