[octavia-tempest-plugin] Tag zed-last

Zed branch is moving to unmaintained state 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 unmaintained state then, Tempest and
its plugins compatible tag[2][3] needs to be released which can be used
to test the unmaintained stable branches.

Tagging 'zed-last' as well as a new version with latest hash.

[1] https://review.opendev.org/q/topic:%22zed-unmaintained%22
[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

Change-Id: Id9cbc86365f577130cab810c00cb4eba7afa4497

deliverables/dalmatian/octavia-tempest-plugin.yaml

@@ -8,3 +8,8 @@ repository-settings:
 storyboard: 908
 team: octavia
 type: tempest-plugin
+releases:
+  - version: 2.7.0
+    projects:
+      - repo: openstack/octavia-tempest-plugin
+        hash: 6fac2f75450122ccbe2f97ef110c8633bffa4daf

deliverables/zed/octavia-tempest-plugin.yaml

@@ -13,3 +13,7 @@ releases:
     projects:
       - repo: openstack/octavia-tempest-plugin
         hash: 5486b8af9238677d4975493a8cc1afb62f56d8bc
+  - version: zed-last
+    projects:
+      - repo: openstack/octavia-tempest-plugin
+        hash: 6fac2f75450122ccbe2f97ef110c8633bffa4daf