Add futurist to requirements.txt explicitly

After commit df194c8b4c we use
futurist library in horizon code. futurist is already installed
by dependency of oslo.messaging required osprofiler, but it is
better to declare our dependency explicitly rather than depending
on requirements of other library.

Also this commit fixes import grouping related to futurist.

Change-Id: I260b4ea88a5a41808286026815f519693740961b

openstack_dashboard/dashboards/admin/instances/views.py

@@ -17,6 +17,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import futurist
+
 from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.core.urlresolvers import reverse_lazy
@@ -38,8 +40,6 @@ from openstack_dashboard.dashboards.project.instances import views
 from openstack_dashboard.dashboards.project.instances.workflows \
     import update_instance
 
-import futurist
-
 
 # re-use console from project.instances.views to make reflection work
 def console(args, **kvargs):

openstack_dashboard/dashboards/project/instances/views.py

@@ -20,9 +20,10 @@
 Views for managing instances.
 """
 from collections import OrderedDict
-import futurist
 import logging
 
+import futurist
+
 from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.core.urlresolvers import reverse_lazy

requirements.txt

@@ -16,6 +16,7 @@ django-babel>=0.5.1 # BSD
 django-compressor>=2.0 # MIT
 django-openstack-auth>=3.1.0 # Apache-2.0
 django-pyscss>=2.0.2 # BSD License (2 clause)
+futurist>=0.11.0,!=0.15.0  # Apache-2.0
 iso8601>=0.1.11 # MIT
 netaddr!=0.7.16,>=0.7.13 # BSD
 oslo.concurrency>=3.8.0 # Apache-2.0