Fix bash completion for sudo users (mostly cosmetic) + man page and

example fixes

Ticket: CM-2911
Reviewed By: CCR-1637
Testing Done: tested ifupdown2 sanity and bash completion

The python argcomplete module that i use for ifupdown2 has a limitation
that it does not work with sudo when used in the global mode. But there is
a workaround for it online (long story short...instead of enabling the global
argparse complete ...the author recommends registering argparse complete bash
completion individually for your script). This patch does just that.

This patch also moves the udev overrides to their respective packages.
Two of them are owned by ifupdown2.

Conflicts:
	rootconf/default/home/cumulus/sysroot-complete

debian/python-ifupdown2.postrm

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -e
 
@@ -7,7 +7,7 @@ rm -f /sbin/ifup /sbin/ifdown /sbin/ifquery
 case "$1" in
   purge)
     # Note: We don't remove /etc/network/interfaces
-    rm -f /etc/network/run/ifstate
+    rm -f /var/tmp/network/ifstatenew 
 
     if [ -L /etc/network/run ] ; then
       rm -f /etc/network/run
@@ -17,6 +17,11 @@ case "$1" in
     ;;
 esac
 
+udevlink=$(readlink /etc/udev/rules.d/80-networking.rules 2>/dev/null)
+[ -n "$udevlink" -a "$udevlink" == "/dev/null" ] && rm -f /etc/udev/rules.d/80-networking.rules
+udevlink=$(readlink /etc/udev/rules.d/60-bridge-network-interface.rules 2>/dev/null)
+[ -n "$udevlink" -a "$udevlink" == "/dev/null" ] && rm -f /etc/udev/rules.d/60-bridge-network-interface.rules
+
 if [ "$1" = "purge" ] ; then
     update-rc.d networking remove >/dev/null
 fi