Use template for lower-constraints

Small cleanups:

* Use openstack-lower-constraints-jobs template, remove individual
  jobs.
* Sort list of templates

Also, update some minimal requirement for horizon
needs newer versions. This is needed to pass the lower-constraints
job.

Change-Id: I6d69299c6099bdcd3671e7e7c764604676e8eaef
Needed-By: https://review.openstack.org/623229

.zuul.yaml

@@ -1,16 +1,15 @@
 - project:
     templates:
       - check-requirements
-      - publish-openstack-docs-pti
+      - nodejs4-jobs
+      - openstack-lower-constraints-jobs
       - openstack-python-jobs-horizon
       - openstack-python35-jobs-horizon
-      - nodejs4-jobs
+      - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - openstack-tox-lower-constraints
         - horizon-openstack-tox-python3-django111
     gate:
       jobs:
-        - openstack-tox-lower-constraints
         - horizon-openstack-tox-python3-django111

lower-constraints.txt

@@ -14,9 +14,9 @@ cryptography==2.1
 debtcollector==1.2.0
 decorator==3.4.0
 deprecation==1.0
-Django==1.8
+Django==1.11
 django-appconf==1.0.2
-django-babel==0.5.1
+django-babel==0.6.2
 django-compressor==2.0
 django-pyscss==2.0.2
 doc8==0.6.0
@@ -55,7 +55,7 @@ openstacksdk==0.11.2
 os-client-config==1.28.0
 os-service-types==1.2.0
 osc-lib==1.8.0
-oslo.concurrency==3.25.0
+oslo.concurrency==3.26.0
 oslo.config==5.2.0
 oslo.context==2.19.2
 oslo.i18n==3.15.3
@@ -89,7 +89,7 @@ python-cinderclient==3.3.0
 python-dateutil==2.5.3
 python-glanceclient==2.8.0
 python-heatclient==1.10.0
-python-keystoneclient==3.8.0
+python-keystoneclient==3.15.0
 python-mimeparse==1.6.0
 python-neutronclient==6.7.0
 python-novaclient==9.1.0