Match `config.Protocol` for global flag assignment

[terrorbyte]

Currently we make assumptions about web servers being attacked and have some global flags that apply and make those assumptions. This isn't always the case nor wanted behavior. Instead, we should put a check on the config.Protocol that will apply a set of flags/behaviors based on the target. That way, we can provide protocol specific flags and settings, as well as suppress framework messages that are irrelevant to the exploit (my IPv6 windows fragmentation PoC shouldn't be printing the HTTP user agent).

In addition, this should also let us do things like adding HTTP protocol specific flags for missing vhost or path/rootpath flags.

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See #180 (comment)