Finalizing Python3 migration

With this patch, vim-emu is using Python3 as default installation
option.

Change-Id: I1238d1d4c96f641c90508ef20b44b88edbbb8222
Signed-off-by: peusterm <manuel.peuster@uni-paderborn.de>
diff --git a/src/emuvim/api/tango/llcm.py b/src/emuvim/api/tango/llcm.py
index 6cbdda8..6e570d0 100755
--- a/src/emuvim/api/tango/llcm.py
+++ b/src/emuvim/api/tango/llcm.py
@@ -1218,10 +1218,7 @@
     r = list()
     for net in range(base, base + subnet_size):
         subnet = "{0}.{1}.0/{2}".format(prefix, net, mask)
-        try:
-            r.append(ipaddress.ip_network(subnet))
-        except ValueError:
-            r.append(ipaddress.ip_network(unicode(subnet)))
+        r.append(ipaddress.ip_network(subnet))
     return r