Every request with no body that requires body fails with 500

[Andrii Ostapenko]

Each of requests which are expected to have body will fail with 500 error code, if no body is provided. Expected error code 400.
E.g.:

create table:
curl -i http://<magnetodb-api>:8480/v1/data/<tenant_id>/tables -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: <token>"

scan:
curl -i http://<magnetodb-api>:8480/v1/data/<tenant_id>/tables/test_table/scan -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: <token>"

query:
curl -i http://<magnetodb-api>:8480/v1/data/<tenant_id>/tables/test_table/query -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: <token>"

put item:
curl -i http://<magnetodb-api>:8480/v1/data/<tenant_id>/tables/test_table/put_item -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: <token>"

etc

Server side trace:
  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1320, in send
    application, catch_exc_info=False)
  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
    app_iter = application(self.environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
    resp = self.call_func(req, *args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
    return self.func(req, *args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 63, in __call__
    response = req.get_response(self.application)
  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1320, in send
    application, catch_exc_info=False)
  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
    app_iter = application(self.environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/keystonemiddleware/auth_token.py", line 823, in __call__
    return self._call_app(env, start_response)
  File "/usr/local/lib/python2.7/dist-packages/keystonemiddleware/auth_token.py", line 758, in _call_app
    return self._app(env, _fake_start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
    resp = self.call_func(req, *args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
    return self.func(req, *args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 63, in __call__
    response = req.get_response(self.application)
  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1320, in send
    application, catch_exc_info=False)
  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
    app_iter = application(self.environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __call__
    response = self.app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
    resp = self.call_func(req, *args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
    return self.func(req, *args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 246, in __call__
    action_result = self.execute_action(action, request, **action_args)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 260, in execute_action
    return self.dispatch(self.controller, action, request, **action_args)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 269, in dispatch
    return method(*args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/api/__init__.py", line 35, in wrapper
    return f(self, *args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/common/probe.py", line 94, in wrapper
    return f(*args, **kwargs)
TypeError: create_table() takes exactly 4 arguments (3 given)