HTTP outbound gateway - 'request-timeout' should be 'reply-timeout' [INT-2251]

**[Mark Fisher](https://jira.spring.io/secure/ViewProfile.jspa?name=mark.fisher)** opened **[INT-2251](https://jira.spring.io/browse/INT-2251?redirect=false)** and commented

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This issue is a sub-task of #6230
