Support Virtual Hosting

[peritus]

Scott,

I'm using your livetest library as a dependency for https://github.com/peritus/robotframework-httplibrary — and in peritus/robotframework-httplibrary#3 a user wants to use that to make requests to a server that uses virtual hosting (see https://en.wikipedia.org/wiki/Virtual_hosting#Name-based).

That isn't possible with livetest at the moment (I think) because of this line:
https://github.com/storborg/livetest/blob/e8763b7346854aeb589221dc47c6acba9e83370b/livetest/__init__.py#L69

I fixed it like this

peritus/robotframework-httplibrary@fa90e76#diff-0

in the copy of livetest I ship w/ robotframework-httplibrary:

Maybe you want to include that in your copy as well.

all the best,
Filip