[rabbitmq] Upgrade to 3.7.26

Staying current.  Many bugfixes.

Change-Id: Ib95c30380d89c336774d5c74e02ce5cbd9efb5d7

rabbitmq/templates/bin/_rabbitmq-password-hash.py.tpl

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 {{/*
 Licensed under the Apache License, Version 2.0 (the "License");

rabbitmq/templates/bin/_rabbitmq-test.sh.tpl

@@ -57,7 +57,7 @@ rabbit_check_node_count
 function rabbit_find_partitions () {
   NODE_INFO=$(mktemp)
   rabbitmqadmin_authed list nodes -f pretty_json | tee "${NODE_INFO}"
-  cat "${NODE_INFO}" | python -c "
+  cat "${NODE_INFO}" | python3 -c "
 import json, sys, traceback
 print('Checking cluster partitions')
 obj=json.load(sys.stdin)

rabbitmq/values.yaml

@@ -35,9 +35,9 @@ images:
     prometheus_rabbitmq_exporter: docker.io/kbudde/rabbitmq-exporter:v0.21.0
     prometheus_rabbitmq_exporter_helm_tests: docker.io/openstackhelm/heat:stein-ubuntu_bionic
     rabbitmq_init: docker.io/openstackhelm/heat:stein-ubuntu_bionic
-    rabbitmq: docker.io/rabbitmq:3.7.13
+    rabbitmq: docker.io/rabbitmq:3.7.26
     dep_check: quay.io/airshipit/kubernetes-entrypoint:v1.0.0
-    scripted_test: docker.io/rabbitmq:3.7.13-management
+    scripted_test: docker.io/rabbitmq:3.7.26-management
     image_repo_sync: docker.io/docker:17.07.0
   pull_policy: "IfNotPresent"
   local_registry: