Fix some gabbi tests

Last gabbi version checks that data have the right content-type.

In theses tests we say that data in plain/text and we put json that's not
correct, old version was silencly ignored and now this is correctly
checked.

Same when we put data but no content-type.

Since our tests are wrong, this change fixes them.

Change-Id: I9a60db296467b08ef32f956471ef5e4f81f462af

gnocchi/tests/gabbi/gabbits-live/live.yaml

@@ -441,8 +441,7 @@ tests:
       method: POST
       request_headers:
           content-type: plain/text
-      data:
-          archive_policy_name: cookies
+      data: '{"archive_policy_name": "cookies"}'
       status: 415
 
 

gnocchi/tests/gabbi/gabbits/archive.yaml

@@ -485,6 +485,7 @@ tests:
     - name: fail to create policy non-admin
       POST: /v1/archive_policy
       request_headers:
+          content-type: application/json
           x-user-id: b45187c5-150b-4730-bcb2-b5e04e234220
           x-project-id: 16764ee0-bffe-4843-aa36-04b002cdbc7c
       data:

gnocchi/tests/gabbi/gabbits/metric.yaml

@@ -115,8 +115,7 @@ tests:
       POST: /v1/metric
       request_headers:
           content-type: plain/text
-      data:
-          archive_policy_name: cookies
+      data: '{"archive_policy_name": "cookies"}'
       status: 415
 
     - name: create valid metric

gnocchi/tests/gabbi/gabbits/resource.yaml

@@ -157,11 +157,7 @@ tests:
           x-user-id: 0fbb231484614b1a80131fc22f6afc9c
           x-project-id: f3d41b770cc14f0bb94a1d5be9c0e3ea
           content-type: text/plain
-      data:
-          id: f93450f2-d8a5-4d67-9985-02511241e7d1
-          started_at: "2014-01-03T02:02:02.000000"
-          user_id: 0fbb231484614b1a80131fc22f6afc9c
-          project_id: f3d41b770cc14f0bb94a1d5be9c0e3ea
+      data: '{"id": "f93450f2-d8a5-4d67-9985-02511241e7d1", "started_at": "2014-01-03T02:02:02.000000", "user_id": "0fbb231484614b1a80131fc22f6afc9c", "project_id": "f3d41b770cc14f0bb94a1d5be9c0e3ea"}'
       status: 415
 
 # Create a new instance resource, demonstrate that including no data
@@ -339,6 +335,7 @@ tests:
       request_headers:
           x-user-id: 0fbb231484614b1a80131fc22f6afc9c
           x-project-id: f3d41b770cc14f0bb94a1d5be9c0e3ea
+          content-type: application/json
       data:
           host: compute2