Utilise HTTPAddress variable to allow remote customisation of HTTP recv endpoint

[Saxon Milton]

We have a HTTPAddress variable that we’re not currently utilising. Now that we netsender.Send provides the option to customise the HTTP recv endpoint, we could pass the HTTPAddress to netsender.Send in the case that it is defined.

[Saxon Milton]

Merged in http-address-variable (pull request #494)

revid/senders.go: Utilise HTTPAddress variable in config

Resolves issue #394

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