Release neutron-vpnaas for stable/wallaby

This release picks up new commits to neutron-vpnaas since
the last release from stable/wallaby.

This is being proposed as a convenience to help make sure stable
changes are being released. If the team is good with this going out,
please respond with a +1 to let the release team know it is OK to
proceed.

If it is not wanted at this time, or if there are more changes that
would be good to get merged before doing a stable release, please
leave a -1 with a comment with what the team would prefer. We can
then either abandon this patch, or wait for an update with a new
commit hash to use instead.

$ git log --oneline --no-merges 18.0.0..21c38f07c
21c38f07c Add ipsec.secrets reload function to strongSwan driver
265ee7e49 l3ha: fix status updates
b3c7e23e2 Fix failover with L3 HA
c5ff00aaa tests: fix functional tests
2cf345151 Switch to use neutron-tempest-plugin jobs for Wallaby branch
86dfbee13 Update TOX_CONSTRAINTS_FILE for stable/wallaby
04d37c30a Update .gitreview for stable/wallaby

Signed-off-by: Elod Illes <elod.illes@est.tech>
Change-Id: I096dac94e8f449720374c46d1dbb74800ed3997b

deliverables/wallaby/neutron-vpnaas.yaml

@@ -16,6 +16,10 @@ releases:
       - repo: openstack/neutron-vpnaas
         hash: 3d084bf48360a03cea8eb8e2a24149d09ea5c6a6
     diff-start: 17.0.0
+  - version: 18.0.1
+    projects:
+      - repo: openstack/neutron-vpnaas
+        hash: 21c38f07c2dd4672e431fddd81e31784af15a88b
 branches:
   - name: stable/wallaby
     location: 18.0.0.0rc1