component/protobuf-python: add protobuf-python.

component/protobuf-python/buildout.cfg

+[buildout]
+extends =
+  ../protobuf/buildout.cfg
+parts =
+  protobuf-python
+
+[protobuf-python-env]
+PATH = ${protobuf:location}/bin:%(PATH)s
+ 
+[protobuf-python]
+recipe = zc.recipe.egg:custom
+egg = protobuf
+environment = protobuf-python-env
+location = ${buildout:parts-directory}/${:_buildout_section_name_}