network: refactor tables to separate module

network/tables.py

+from django_tables2 import Table, A
+from django_tables2.columns import LinkColumn
+
+from firewall.models import Host
+
+class HostTable(Table):
+    hostname = LinkColumn('network.host', args=[A('pk')])
+
+    class Meta:
+        model = Host
+        attrs = {'class': 'table table-striped table-condensed'}
+        fields = ('hostname', 'vlan', 'mac', 'ipv4', 'ipv6',
+                  'pub_ipv4', 'created_at', 'owner', )
+

network/views.py

 from django.views.generic import TemplateView
 from django.views.generic import UpdateView
 
-from django_tables2 import SingleTableView, Table, A
-from django_tables2.columns import LinkColumn
+from django_tables2 import SingleTableView
 
 from firewall.models import Host
+from .tables import HostTable
 
 
 class IndexView(TemplateView):
     template_name = "network/index.html"
 
 
-class HostTable(Table):
-    hostname = LinkColumn('network.host', args=[A('pk')])
-
-    class Meta:
-        model = Host
-        attrs = {'class': 'table table-striped table-condensed'}
-        fields = ('hostname', 'vlan', 'mac', 'ipv4', 'ipv6',
-                  'pub_ipv4', 'created_at', 'owner', )
-
-
 class HostList(SingleTableView):
     model = Host
     table_class = HostTable