[APIv2] remove a method that places in wrong file

"construct_ngs_for_scaling" has no relation to "plugin", and
it already existes in "clusters.py".
There are also some trivial fixes.

Change-Id: I51bef93fdb66c44726cc0c7f67e478c4f29dd342

sahara/api/middleware/auth_valid.py

@@ -73,7 +73,7 @@ class AuthValidatorV2(base.Middleware):
         Handle incoming requests by checking tenant info from the
         headers and url ({tenant_id} url attribute), if using v1 or v1.1
         APIs. If using the v2 API, this function will check the token
-        tenant and the requested tenent in the headers.
+        tenant and the requested tenant in the headers.
 
         Pass request downstream on success.
         Reject request if tenant_id from headers is not equal to the
@@ -91,7 +91,6 @@ class AuthValidatorV2(base.Middleware):
                     version, rest = strutils.split_path(path, 2, 2, True)
                     requested_tenant = req.headers.get('OpenStack-Project-ID')
                 else:
-
                     version, requested_tenant, rest = strutils.split_path(
                         path, 3, 3, True)
             except ValueError:

sahara/service/api/v2/plugins.py

@@ -13,16 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from sahara import conductor as c
-from sahara import context
 from sahara.plugins import base as plugin_base
 
 
-conductor = c.API
-
-
 # Plugins ops
 
+
 def get_plugins():
     return plugin_base.PLUGINS.get_plugins(serialized=True)
 
@@ -33,14 +29,3 @@ def get_plugin(plugin_name, version=None):
 
 def update_plugin(plugin_name, values):
     return plugin_base.PLUGINS.update_plugin(plugin_name, values)
-
-
-def construct_ngs_for_scaling(cluster, additional_node_groups):
-    ctx = context.ctx()
-    additional = {}
-    for ng in additional_node_groups:
-        count = ng['count']
-        ng['count'] = 0
-        ng_id = conductor.node_group_add(ctx, cluster, ng)
-        additional.update({ng_id: count})
-    return additional