Js-code from lib/model.js gets included in SOAP-request causing SOAP-fault

Steps to reproduce

• bug

I have auto discovered a SOAP 1.1 Webservice with lb soap and Loobback created models as expected. However when using the StrongLoop API explorer, the SOAP requests fail as they are not properly formatted.

Stack trace

"Error: faultcode: soap:Client faultstring: Unmarshalling Error: cvc-complex-type.2.4.a: Invalid content was found starting with element '__cachedRelations'. One of '{xxx, xxx}' is expected.
at XMLHandler.xmlToJson (testapp\node_modules\strong-soap\src\parser\xmlHandler.js:635:23)
at testapp\node_modules\strong-soap\src\client.js:279:28
at testapp\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\observer.js:172:22
at doNotify (testapp\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\observer.js:99:49)
at SOAPConnector.ObserverMixin._notifyBaseObservers (testapp\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\observer.js:122:5)
at SOAPConnector.ObserverMixin.notifyObserversOf (testapp\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\observer.js:97:8)
at cbForWork (testapp\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\observer.js:162:14)
at Request._callback (testapp\node_modules\loopback-connector-soap\lib\http.js:98:9)
at Request.self.callback (testapp\node_modules\request\request.js:188:22)
at emitTwo (events.js:106:13)
at Request.emit (events.js:191:7)
at Request.<anonymous> (testapp\node_modules\request\request.js:1171:10)
at emitOne (events.js:96:13)
at Request.emit (events.js:188:7)
at IncomingMessage.<anonymous> (testapp\node_modules\request\request.js:1091:12)\
at IncomingMessage.g (events.js:292:16)"

When enabling the debug on loopback:persisted-model I can see the SOAP xml is cluttered by code originating from strongloop/loopback-datasource-juggler as is mentioned in issue 77 from loopback-connecter-soap by @liudonghua123. Since the code is in this repo I thought it would be best to open an issue here.

Expected result

I would expect the SOAP request to be properly formatted. And a SOAP response without an error.

Additional information

win32 x64 6.11.0

+-- loopback@3.8.0
+-- loopback-boot@2.24.1
+-- loopback-component-explorer@2.7.0
+-- loopback-connector-soap@4.0.0
+-- loopback-datasource-juggler@3.9.1