Remove pbr warnerrors in favor of sphinx check

This change removes the now unused "warnerrors" setting,
which is replaced by "warning-is-error" in sphinx
releases >= 1.5[0].

[0] http://lists.openstack.org/pipermail/openstack-dev/2017-March/113085.html

Change-Id: Idb373fb229b783f76755207767b0a1b42516d0be

setup.cfg

@@ -17,9 +17,8 @@ classifier =
 source-dir = doc/source
 build-dir = doc/build
 all_files = 1
-
-[pbr]
-warnerrors = True
+builders = html
+warning-is-error = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html

specs/pike/like-filter.rst

@@ -116,15 +116,15 @@ Microversion bump is required for this change.
     }
 
 
-List snapshot with share snapshot name
+    List snapshot with share snapshot name
 
-GET /v2/<tenant_id>/snapshots?name~=snap_test
+    GET /v2/<tenant_id>/snapshots?name~=snap_test
 
-Accept: application/json
+    Accept: application/json
 
-JSON Response
+    JSON Response
 
-{
+    {
        "shares": [
            {
                 "status": "available",
@@ -137,7 +137,7 @@ JSON Response
                 ...
            }
        ]
-}
+    }
 
 Client impact
 -------------