Fix some gabbi tests

Some asserts done by gabbi was failling due to:

  https://github.com/cdent/wsgi-intercept/pull/32

Since the fix have been released the tests now pass.

Closes-bug: #1426483
Change-Id: I932707e59a6e3b4d753532456877b4d1383aa7c5

ceilometer/tests/gabbi/gabbits/meters.yaml

@@ -64,8 +64,6 @@ tests:
       status: 400
 
     - name: post meter error is JSON
-      desc: https://bugs.launchpad.net/ceilometer/+bug/1426483
-      xfail: true
       url: /v2/meters/apples?direct=True
       method: POST
       request_headers:
@@ -75,8 +73,7 @@ tests:
       response_headers:
           content-type: /application/json/
       response_json_paths:
-          error_message:
-              faulstring: 'Missing argument: "samples"'
+          $.error_message.faultstring: "Samples should be included in request body"
 
     - name: post meter bad content-type
       desc: https://bugs.launchpad.net/wsme/+bug/1419110

ceilometer/tests/gabbi/gabbits/samples.yaml

@@ -96,8 +96,6 @@ tests:
 
     - name: negative limit value error message
       url: /v2/samples?limit=-99
-      desc: https://bugs.launchpad.net/ceilometer/+bug/1426483
-      xfail: true
       status: 400
       response_headers:
           content-type: /application/json/
@@ -151,8 +149,6 @@ tests:
 
     - name: attempt missing sample
       url: /v2/samples/davesnothere
-      desc: https://bugs.launchpad.net/ceilometer/+bug/1426483
-      xfail: true
       status: 404
       response_headers:
           content-type: /application/json/