pylint: fix KeyError: <type 'numpy.ufunc'> visible with pandas 0.24.2

Updating pandas to 0.24.2 revealed as :

      File "develop-eggs/astroid-1.3.8+slapospatched001-py2.7.egg/astroid/raw_building.py", line 360, in _set_proxied
        return _CONST_PROXY[const.value.__class__]
    KeyError: <type 'numpy.ufunc'>

when linting code referencing pandas. The problem is actually with
some numpy `ufunc`, such as numpy.sin, but we don't seem to have code
using it in the test suite.

product/ERP5Type/patches/pylint.py

@@ -486,6 +486,11 @@ else:
   _register_module_extender_from_live_module('xmlsec.tree', xmlsec.tree)
   _register_module_extender_from_live_module('xmlsec.template', xmlsec.template)
 
+
+import numpy.core
+_register_module_extender_from_live_module('numpy.core.umath', numpy.core.umath)
+
+
 # Properly search for namespace packages: original astroid (as of 1.3.8) only
 # checks at top-level and it doesn't work for Shared.DC.ZRDB (defined in
 # Products.ZSQLMethods; Shared and Shared.DC being a namespace package defined

product/ERP5Type/tests/testDynamicClassGeneration.py

@@ -2319,6 +2319,11 @@ def xmlsec_decrypt():
   decrypted = enc_ctx.decrypt(enc_data)
   print(lxml.etree.tostring(decrypted))
 
+import numpy
+numpy.sin([])
+import pandas
+pandas.DataFrame([])
+
 """ % (dict(namespace=namespace,
             reference1=imported_reference1,
             module2=imported_module2,