Add a default value for externalConfigurationServiceUrl in application.yml (#346)

* Add a default value for `externalConfigurationServiceUrl` in `application.yml` as this is validated as required and the local environment will not start correctly without it.

Author: MartinWheelerMT

service/src/main/resources/application.yml

@@ -27,7 +27,7 @@ soap:
 itk:
   odsCodes: ${PEM111_ITK_ODS_CODE_LIST:}
   dosIds: ${PEM111_ITK_DOS_ID_LIST:}
-  externalConfigurationServiceUrl: ${PEM111_ITK_EXTERNAL_CONFIGURATION_URL:}
+  externalConfigurationServiceUrl: ${PEM111_ITK_EXTERNAL_CONFIGURATION_URL:http://localhost:8110/configuration/ods-dos}
   fetchIntervalMinutes: ${PEM111_ITK_FETCH_INTERVAL_MIN:5}
 
 version: ${PEM111_VERSION:1.0.3}