epc-as-a-service functionality added

Change-Id: Ia1da1cb2c82eaf77cf87e9e80f3f1a93c433cbe5
diff --git a/xos/models.py b/xos/models.py
index 12e137f..459d9f7 100644
--- a/xos/models.py
+++ b/xos/models.py
@@ -15,15 +15,13 @@
 import traceback
 from xos.exceptions import *
 from xos.config import Config
-from django.contrib.contenttypes.models import ContentType
-from django.contrib.contenttypes.fields import GenericForeignKey
 
 class VHSSService(VHSSService_decl):
    class Meta:
         proxy = True 
 
    def create_tenant(self, **kwargs):
-       t = VHSSTenant(kind="vEPC", provider_service=self, connect_method="na", tenant_message="vhss tenant in service chain", **kwargs)
+       t = VHSSTenant(kind="vEPC", provider_service=self, connect_method="na", **kwargs)
        t.save()
        return t