Fixed some references to utils

Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/nfvo.py b/nfvo.py
index c793226..d528f85 100644
--- a/nfvo.py
+++ b/nfvo.py
@@ -2370,7 +2370,7 @@
     if tenant_id == "any":
         tenant_id=None
 
-    if af.check_valid_uuid(datacenter): 
+    if utils.check_valid_uuid(datacenter): 
         result, vims = get_vim(mydb, nfvo_tenant=tenant_id, datacenter_id=datacenter)
     else:
         result, vims = get_vim(mydb, nfvo_tenant=tenant_id, datacenter_name=datacenter)
@@ -2446,4 +2446,4 @@
         return result, content
     return vim_action_get(mydb, tenant_id, datacenter, item, content)
 
-    
\ No newline at end of file
+