Enable SSL Hostname Verification [AMQP-830]

**[Gary Russell](https://jira.spring.io/secure/ViewProfile.jspa?name=grussell)** opened **[AMQP-830](https://jira.spring.io/browse/AMQP-830?redirect=false)** and commented


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**Referenced from:** pull request https://github.com/spring-projects/spring-amqp/pull/798

**Backported to:** [1.7.10](https://github.com/spring-projects/spring-amqp/milestone/192?closed=1)
