Revert "Monkey-patch NEMU to fix demo with recent iproute"

This reverts commit 7dbc38d7.

Fixed upstream in version 0.2
See also http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=725344

demo/demo

@@ -33,29 +33,6 @@ def _add_interface(node, iface):
     return Node__add_interface(node, iface)
 nemu.Node._add_interface = _add_interface
 
-def get_addr_data():
-    ipdata = backticks([IP_PATH, "-o", "addr", "list"])
-
-    byidx = {}
-    bynam = {}
-    for line in ipdata.split("\n"):
-        if line == "":
-            continue
-        match = re.search(r'^(\d+):\s+(\S+?)(:?)\s+(.*)', line)
-        if not match:
-            raise RuntimeError("Invalid `ip' command output")
-        idx = int(match.group(1))
-        name = match.group(2)
-        # <patch>
-        if name not in bynam:
-            bynam[name] = byidx[idx] = []
-            if match.group(3): # BBB: old iproute also shows link info
-                continue
-        # </patch>
-        bynam[name].append(_parse_ip_addr(match.group(4)))
-    return byidx, bynam
-nemu.iproute.get_addr_data.func_code = get_addr_data.func_code
-
 # create nodes
 for name in """internet=I registry=R
                           gateway1=g1 machine1=1 machine2=2