[sahara-tests] Tag train-last

Train branch is in Extended Maintenance now[1]. Tempest and
tempest plugins are branchless which means master version of
Tempest and its plugins is used to test the supported stable
branches.

Once any stable branch is moved to EM state then, Tempest and
its plugins compatible tag[2] needs to be released so that we can
keep testing the EM stable branches with that tag once master
Tempest and its plugins are not compatible[3].

Tagging 'train-last'[4] with thr latest hash.

[1] https://releases.openstack.org/train/index.html
[2] https://docs.openstack.org/tempest/latest/stable_branch_support_policy.html
[3] https://docs.openstack.org/tempest/latest/tempest_and_plugins_compatible_version_policy.html
[4] https://docs.openstack.org/project-team-guide/stable-branches.html#extended-maintenance

Change-Id: I26387cf38125c382168b4bdb2148c0bf1dd53b95

deliverables/train/sahara-tests.yaml

@@ -10,5 +10,9 @@ releases:
     projects:
       - repo: openstack/sahara-tests
         hash: a225824efc44271e36bc1242d9160a153537c722
+  - version: train-last
+    projects:
+      - repo: openstack/sahara-tests
+        hash: 98063d3fd93ce77cb3ecbbd33868bbe5dd3a6865
 repository-settings:
   openstack/sahara-tests: {}