Convert legacy tox requirements jobs

Move legacy tox jobs specific to requirements repo here and convert them
to zuul v3 native jobs.

Needed-By: If2877e49b99f71abd2ca6ae0d1840ee14ae4600d
Change-Id: I3e8542dd20b918d07e351498be412061d8a398a2

.zuul.d/jobs.yaml

@@ -0,0 +1,45 @@
+- job:
+    name: requirements-tox-babel
+    parent: openstack-tox
+    description: |
+      Run test for requirements project.
+
+      Uses tox with the ``babel`` environment.
+    files:
+      - ^babel-test/.*
+      - ^tox.ini
+      - ^upper-constraints.txt
+    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-py35-check-uc
+    parent: openstack-tox
+    description: |
+      Run test for requirements project.
+
+      Uses tox with the ``py35-check-uc`` environment.
+    files: ^upper-constraints.*txt$
+    vars:
+      tox_envlist: py35-check-uc
+
+- job:
+    name: requirements-tox-validate-projects
+    parent: openstack-tox
+    description: |
+      Run test for requirements project.
+
+      Uses tox with the ``validate-projects`` environment.
+    vars:
+      tox_envlist: validate-projects

.zuul.d/project.yaml

@@ -3,6 +3,11 @@
     check:
       jobs:
         - openstack-tox-validate
+        - requirements-tox-babel
+        - requirements-tox-py27-check-uc
+        - requirements-tox-py35-check-uc:
+            branches: ^(?!stable/(newton|ocata|pike)).*$
+        - requirements-tox-validate-projects
         - cross-cinder-py27
         - cross-cinder-py35:
             branches: ^(?!stable/(newton|ocata)).*$
@@ -29,6 +34,11 @@
       queue: integrated
       jobs:
         - openstack-tox-validate
+        - requirements-tox-babel
+        - requirements-tox-py27-check-uc
+        - requirements-tox-py35-check-uc:
+            branches: ^(?!stable/(newton|ocata|pike)).*$
+        - requirements-tox-validate-projects
         - cross-cinder-py27
         - cross-cinder-py35:
             branches: ^(?!stable/(newton|ocata)).*$