stack/erp5: Adapt to buildout3

Use official SOAPpy=0.12.22 compatible with pip.
Downgrade zope.authentication=4.5.0 because 5.0 requires Python>=3.7.

stack/erp5/buildout.cfg

@@ -493,8 +493,17 @@ egg = ${:_buildout_section_name_}
 setup-eggs +=
   ${persistent:egg}
 
+[wstools]
+# a SOAPpy dependency
+recipe = zc.recipe.egg:custom
+egg = wstools
+setup-eggs =
+  pbr
+  pytest-runner
+
 [eggs]
 <= neoppod
+depends = ${wstools:recipe}
 eggs = ${neoppod:eggs}
   ${caucase-eggs:eggs}
   ${wendelin.core:egg}
@@ -741,9 +750,6 @@ pylint = 1.4.4+SlapOSPatched002
 # astroid 1.4.1 breaks testDynamicClassGeneration
 astroid = 1.3.8+SlapOSPatched001
 
-# modified version that works fine for buildout installation
-SOAPpy = 0.12.0nxd001
-
 
 # Pinned versions
 alabaster = 0.7.12
@@ -826,6 +832,7 @@ rfc3987 = 1.3.8
 rsa = 3.4.2
 scikit-image = 0.14.0
 scipy = 0.19.0
+SOAPpy = 0.12.22
 spyne = 2.12.14
 strict-rfc3339 = 0.7
 StructuredText = 2.11.1
@@ -842,6 +849,7 @@ WebOb = 1.8.5
 WebTest = 2.0.33
 WSGIProxy2 = 0.4.6
 WSGIUtils = 0.7
+wstools = 0.4.8
 xfw = 0.10
 xupdate-processor = 0.5
 yapf = 0.28.0
@@ -854,7 +862,7 @@ zope.app.dependable = 3.5.1
 zope.app.form = 5.1.0
 zope.app.publication = 4.5
 zope.app.testing = 4.0.0
-zope.authentication = 5.0
+zope.authentication = 4.5.0
 zope.error = 4.6
 zope.minmax = 2.3
 zope.password = 4.4