rabbitmq: Improve healthcheck script output

We've seen multiple occassions of all these healthcheck commands
not being able to be executed in 30s after the switch to RMQ 4.1.
Let's put more information in the Docker/Podman healthcheck logs.

Change-Id: I4b1b54983144f5514a6703c255d2cb4fa052a0fb

Author: mnasiadka

docker/rabbitmq/healthcheck_rabbitmq

@@ -2,9 +2,7 @@
 
 set -e
 
-rabbitmq-diagnostics -t 5 -q ping || exit 1
-rabbitmq-diagnostics -t 5 -q status || exit 1
-rabbitmq-diagnostics -t 5 -q check_running || exit 1
-rabbitmq-diagnostics -t 5 -q check_local_alarms || exit 1
-rabbitmq-diagnostics -t 5 -q check_port_connectivity || exit 1
-rabbitmq-diagnostics -t 5 -q check_virtual_hosts || exit 1
+for check in ping status check_running check_local_alarms check_port_connectivity check_virtual_hosts; do
+    echo "Running rabbitmq-diagnostics $check"
+    rabbitmq-diagnostics -t 5 -q $check || (echo "ERROR: $check failed" && exit 1)
+done