squash! 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 so that Testing.ZopeTestCase.utils.makerequest creates
a REQUEST to this host:port, but now that Zope's startZServer no longer,
the REQUEST created by Testing.ZopeTestCase.base.app is always to
nohost:80, so we need to rewrap the app in request to our host:port.
23 jobs for zope4py2 in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
canceled ERP5.CodingStyleTest-Zope4Py2

12:45:37

canceled ERP5.UnitTest-Zope4Py2

05:40:03

failed ERP5.CodingStyleTest-Zope4Py2

08:08:39

failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

09:29:35

failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

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failed ERP5.CodingStyleTest-Zope4Py2

08:07:38

failed ERP5.CodingStyleTest-Zope4Py2

08:07:46

failed ERP5.CodingStyleTest-Zope4Py2

10:43:35

failed ERP5.UnitTest-Zope4Py2

196:34:39