Move username and password into the data model

Change-Id: Iab1d4dd3acdc6b08c81a256b146e9652c9b75481
(cherry picked from commit d1bfbd87e1d4a6f673d29391cec5bc4e7da6757e)
diff --git a/xos/models/venb.xproto b/xos/models/venb.xproto
index 413edea..e021cc7 100644
--- a/xos/models/venb.xproto
+++ b/xos/models/venb.xproto
@@ -3,6 +3,8 @@
 
 message VENBService (Service){
     option verbose_name = "Virtual eNodeB Service";
+    required string login_user = 1 [help_text = "vENB VM login user", default = "cfguser", max_length = 32, content_type = "stripped", null = False, db_index = False, blank = False];
+    required string login_password = 2 [help_text = "vENB VM login password", default = "cfguser", max_length = 32, content_type = "stripped", null = False, db_index = False, blank = False];
 }
 
 message VENBServiceInstance (TenantWithContainer){