Do:

screen -x stack

And see why the service failed.

You don't need to make modifications to the stackrc file, just override the variable values with what you need in the localrc one.

When i do this screen -x stack i get this:

Traceback (most recent call last):
File "/opt/stack/keystone/bin/keystone-all", line 118, in <module>
int(CONF.admin_port)))
File "/opt/stack/keystone/bin/keystone-all", line 35, in create_server
app = deploy.loadapp('config:%s' % conf, name=name)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
return loadobj(APP, uri, name=name, **kw)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
return context.create()
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
return self.object_type.invoke(self)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 144, in invoke
**context.local_conf)
File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 56, in fix_call
val = callable(*args, **kw)
File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 25, in urlmap_factory
app = loader.get_app(app_name, global_conf=global_conf)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 350, in get_app
name=name, global_conf=global_conf).create()
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 362, in  app_context
APP, name=name, global_conf=global_conf)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 450, in get_context
global_additions=global_additions)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 559, in _pipeline_app_context
APP, pipeline[-1], global_conf)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 458, in get_context
section)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 517, in _context_from_explicit
value = import_string(found_expr)
File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 22, in import_string
return pkg_resources.EntryPoint.parse("x=" + s).load(False)
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2013, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File "/opt/stack/keystone/keystone/service.py", line 44, in <module>
mapping_api=mapping.Manager(),
File "/opt/stack/keystone/keystone/common/dependency.py", line 32, in __wrapped_init__
init(self, *args, **kwargs)
File "/opt/stack/keystone/keystone/contrib/mapping/core.py", line 17, in __init__
super(Manager, self).__init__(CONF.mapping.driver)
File "/opt/stack/keystone/keystone/common/manager.py", line 36, in __init__
self.driver = importutils.import_object(driver_name)
File "/opt/stack/keystone/keystone/openstack/common/importutils.py", line 40, in import_object
return import_class(import_str)(*args, **kwargs)
File "/opt/stack/keystone/keystone/openstack/common/importutils.py", line 28, in import_class
mod_str, _sep, class_str = import_str.rpartition('.')
AttributeError: 'NoneType' object has no attribute 'rpartition'