zuul: move jobs in-tree new barbican simple-crypto job

Move the job definitions in-tree, updating them when needed
(no more python 2 jobs).
The old barbican simple-crypto job name is still available as an alias
for a while, but it is time to switch away from it.

Depends-On: https://review.opendev.org/771443
Change-Id: Iba7b4106c49e4b492c97097648c7b8f599a2ca4b

.zuul.yaml

@@ -1,7 +1,10 @@
 - project:
+    templates:
+      - openstack-python3-wallaby-jobs
+      - check-requirements
     check:
       jobs:
-        - barbican-simple-crypto-devstack-tempest-cursive
+        - barbican-tempest-plugin-simple-crypto-cursive
     gate:
       jobs:
-        - barbican-simple-crypto-devstack-tempest-cursive
+        - barbican-tempest-plugin-simple-crypto-cursive