Fix lowercase adminserver name (#4035)

* Fix when AdminServerName not specified and the filter generates AdminServer which conflicts if the model has a server named adminserver (lower cased) where the listen address will be the same for both server and WLS does not allow that.

Author: jshum2479

operator/src/main/resources/scripts/model-wdt-create-filter.py

@@ -19,6 +19,8 @@ def filter_model(model):
         admin_server = topology['AdminServerName']
       else:
         # weblogic default
+        if 'Server' in topology and 'adminserver' in topology['Server']:
+          raise ValueError('Your model does not have AdminServerName set in the topology section but have a server named "adminserver" in topology/Server section, this is not supported.  Please set the AdminServerName attribute in the topology section to the actual administration server name')
         admin_server = 'AdminServer'
       model['topology'] = {}
       model['topology']['AdminServerName'] = admin_server