Make accept-language tests work with webob 1.8.x

webob 1.8.x has altered its processing for accept-* headers [1],
including being less accomodating of less than well-formed qvalues.
If it is unable to parse a header, rather than raising an error of
anything like that, a special class of header is created instead.
This header still responds on all the same methods as before, but with
different results. In the big picture this is a good thing (for
correcting processing for content-negotiation) but it is a bit weird
for us.

This change fixes the immediate short term problem, broken unit tests,
by fixing their bad qvalues. The new values will continue to work with
old webob. We can hope/assume that most clients will send well-formed
qvalues.

Longer term we will need to address how the nova Request object is
choosing to do best match handling on accept headers to address that
webob has deprecated (with a long warning period) methods used by the
object.

Partial-Bug: #1765748

[1] https://docs.pylonsproject.org/projects/webob/en/stable/whatsnew-1.8.html#backwards-incompatibilities

Change-Id: I2034d30cc8d9354be80d39e05b8488cb99c32ecf

nova/tests/unit/api/openstack/test_wsgi.py

@@ -99,7 +99,7 @@ class RequestTest(MicroversionedTest):
 
     def test_from_request(self):
         request = wsgi.Request.blank('/')
-        accepted = 'bogus;q=1.1, en-gb;q=0.7,en-us,en;q=.5,*;q=.7'
+        accepted = 'bogus;q=1, en-gb;q=0.7,en-us,en;q=0.5,*;q=0.7'
         request.headers = {'Accept-Language': accepted}
         self.assertEqual(request.best_match_language(), 'en_US')
 
@@ -107,7 +107,7 @@ class RequestTest(MicroversionedTest):
         # asterisk should match first available if there
         # are not any other available matches
         request = wsgi.Request.blank('/')
-        accepted = '*,es;q=.5'
+        accepted = '*,es;q=0.5'
         request.headers = {'Accept-Language': accepted}
         self.assertEqual(request.best_match_language(), 'en_GB')
 
@@ -119,7 +119,7 @@ class RequestTest(MicroversionedTest):
 
     def test_secondary(self):
         request = wsgi.Request.blank('/')
-        accepted = 'nn,en-gb;q=.5'
+        accepted = 'nn,en-gb;q=0.5'
         request.headers = {'Accept-Language': accepted}
         self.assertEqual(request.best_match_language(), 'en_GB')