Rename udev's rules/ to rules.d/

This change is only about the source tree. We have tmpfiles.d/, modprobe.d/,
sysctl.d/, and sysusers.d/, but for historical reasons, rules/ didn't fit this
pattern. We also *install* it as rules.d/. Let's rename to be consistent.

rules.d/75-net-description.rules

@@ -0,0 +1,14 @@
+# do not edit this file, it will be overwritten on update
+
+ACTION=="remove", GOTO="net_end"
+SUBSYSTEM!="net", GOTO="net_end"
+
+IMPORT{builtin}="net_id"
+
+SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id", IMPORT{builtin}="hwdb --subsystem=usb"
+SUBSYSTEMS=="usb", GOTO="net_end"
+
+SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"
+SUBSYSTEMS=="pci", IMPORT{builtin}="hwdb --subsystem=pci"
+
+LABEL="net_end"