Remove invalid URL in gabbi tests

The use of a literal snowman in a URL is an invalid URL. In Python 3
the url parsing code used by gabbi will not accept this URL and
correctly rejects it. Python 2 is less strict and passes it on
(presumably encoding it somewhere in the stack).

Python 3's behavior is correct and the fact that the test ever
worked was an artifact of Python 2's bad behavior. The test
immediately following the removed test is testing the correct and
legitimate HTTP behavior, so it is best to just remove the bad one.

By doing so all functional tests pass under python3 so the
test-functional-py3.txt has been made empty, with a comment. This
was done, instead of removing it, to signal the state of affairs.

Change-Id: If40f5093c65491dcfc225dffd95c6dc1318a0f99

nova/tests/functional/api/openstack/placement/gabbits/unicode.yaml

@@ -9,11 +9,6 @@ defaults:
 
 tests:
 
-- name: get a raw snowman unicode
-  desc: this should fall through to a NotFound on the resource provider object
-  GET: /resource_providers/☃
-  status: 404
-
 - name: get an encoded snowman
   desc: this should fall through to a NotFound on the resource provider object
   GET: /resources_providers/%e2%98%83

tests-functional-py3.txt

@@ -1,4 +1 @@
-##############################################################################
-# NOTE(dims): The following test looks like a gabbi failure under python 3.5
-##############################################################################
-nova.tests.functional.api.openstack.placement.test_placement_api.unicode_get_a_raw_snowman_unicode.test_request
+# All functional tests currently work with python 3.5.