zope4py2: fix usage of _Z2HOST
_Z2HOST / _Z2PORT no longer exist in Zope4, something was added in component/egg-patch/Zope/0001-OFS-XMLExportImport.patch in SlapOS software release, but we never had a strong need to patch there, we were doing this (I guess) so that Testing.ZopeTestCase.utils.startZServer knows that a server is already running and refuse to start another one, but now that Zope's startZServer no longer exist, a local variable is just fine.
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