[monitoring-plugins/monitoring-plugins] check_http: support the concept of virtual ports (#1352)

[waja]

> aside: what is "http virtual port"? :D

The issie is actually, that when you pass a specific port to
```check_http```, this port is also used in the host header.
This might cause trouble on the server (or even better on web application
level), when you are using port forwarding (or something similar) and the
web application doesn't know about that and is expecting not to have a port
(or a different one) in the host header, then ```check_http``` is using to
connect to the server side.

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