python gateway close()

[wmoore]

Gateways created with session.createGateway() seem to leave some services open after gateway.close() has been called.

This causes a security exception when you try to change security context (switch group etc).

======================================================================
ERROR: testThumbs (__main__.TestThumbnailPerms)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test/integration/thumbnailPerms.py", line 149, in testThumbs
    client_share1.sf.setSecurityContext(omero.model.ExperimenterGroupI(gid2, False))
  File "/Users/will/Documents/workspace/Omero/dist/lib/python/omero_API_ice.py", line 197, in setSecurityContext
    return _M_omero.api.ServiceFactory._op_setSecurityContext.invoke(self, ((obj, ), _ctx))
SecurityViolation: exception ::omero::SecurityViolation
{
    serverStackTrace = ome.conditions.SecurityViolation: SecurityContext change cancelled:
Client b3d9112e-1e29-443f-9429-676459fb3d71 has active stateful services: count=10

	at ome.services.sessions.events.ChangeSecurityContextEvent.throwIfCancelled(ChangeSecurityContextEvent.java:61)
	at ome.services.sessions.SessionManagerImpl.setSecurityContext(SessionManagerImpl.java:1099)
	at ome.services.blitz.impl.ServiceFactoryI.setSecurityContext(ServiceFactoryI.java:312)
	at omero.api._ServiceFactoryDisp.___setSecurityContext(_ServiceFactoryDisp.java:385)
	at omero.api._ServiceFactoryDisp.__dispatch(_ServiceFactoryDisp.java:1347)
	at IceInternal.Incoming.invoke(Incoming.java:159)
	at Ice.ConnectionI.invokeAll(ConnectionI.java:2037)
	at Ice.ConnectionI.message(ConnectionI.java:972)
	at IceInternal.ThreadPool.run(ThreadPool.java:577)
	at IceInternal.ThreadPool.access$100(ThreadPool.java:12)
	at IceInternal.ThreadPool$EventHandlerThread.run(ThreadPool.java:971)

    serverExceptionClass = ome.conditions.SecurityViolation
    message = SecurityContext change cancelled:
Client b3d9112e-1e29-443f-9429-676459fb3d71 has active stateful services: count=10

}

[wmoore]

(In [7748]) Adding Python integration tests see #2067, one of which fails: See #2658.