rabbitmq helm-chart must not contain secrets directly in templates

[kayrus]

currently secrets are defined inline, thus they appear in concourse CI helm diff output.

see

helm-charts/common/rabbitmq/templates/deployment.yaml

Line 99 in e7e14a8

- name: RABBIT_PASSWORD

helm-charts/common/rabbitmq/templates/bin-configmap.yaml

Line 12 in e7e14a8

{{ include (print .Template.BasePath "/bin/_rabbitmq-start.tpl") . | indent 4 }}

helm-charts/common/rabbitmq/templates/bin/_rabbitmq-start.tpl

Line 26 in e7e14a8

upsert_user {{ .Values.users.default.user | include "rabbitmq.shell_quote" }} {{ required ".Values.users.default.password missing" .Values.users.default.password | include "rabbitmq.shell_quote" }}