Remove requirements-tox-py27-check-uc job

As neutron-lib became python 3 only, the py27 upper constraint check
job fails. Let's get rid of it as it is not needed anymore.

Change-Id: I0e7cbf1392247ab89c8d82c299980790f65d69bb

.zuul.d/jobs.yaml

@@ -12,17 +12,6 @@
     vars:
       tox_envlist: babel
 
-- job:
-    name: requirements-tox-py27-check-uc
-    parent: openstack-tox
-    description: |
-      Run test for requirements project.
-
-      Uses tox with the ``py27-check-uc`` environment.
-    files: ^upper-constraints.*txt$
-    vars:
-      tox_envlist: py27-check-uc
-
 - job:
     name: requirements-tox-py36-check-uc
     parent: openstack-tox-py36

.zuul.d/project.yaml

@@ -20,7 +20,6 @@
         - requirements-tox-babel
         - requirements-tox-bindep:
             voting: false
-        - requirements-tox-py27-check-uc
         - requirements-tox-py36-check-uc
         - requirements-tox-validate-projects:
             voting: false
@@ -68,7 +67,6 @@
               - bindep.txt
         - openstack-tox-validate
         - requirements-tox-babel
-        - requirements-tox-py27-check-uc
         - requirements-tox-py36-check-uc
         - cross-cinder-py36
         - cross-glance-py36