Add tls_verify option to the rabbitmq configuration options documented in README (#4303)
Add tls_verify option to the rabbitmq configuration options documented in README (#4303)

* add the ssl_verify option to the rabbitmq README doc as an instance option

* add text about ssl_verify option in rabbitmq example config with the plugin

* switch rabbitmq README.md addition of cert chain verification option from ssl_verify to tls_verify after recent changes with config remapper

* avoid changing conf.yaml.example for rabbitmq integration when README.md change is all that is needed

* make suggested changes to README per PR review comments

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