Tests host refactoring

[ruflin]

Make the hostname in the tests dynamic to not require elasticsearch to run on localhost. This is in preparation for also test separations (unit, integration, ...) to make the tests run faster.

@im-denisenko FYI

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[im-denisenko]

@ruflin lgtm.

However, I don't get how it's related to test groups.
I partially implement this separation, based on master, and it's already works fine.

[ruflin]

• There will probably some conflicts as your changes will touch all the tests
• The test which use a client, are normally the functional tests.

Unfortunately my builds are not green yet.

[im-denisenko]

There will probably some conflicts as your changes will touch all the tests

I tried to merge this branch, only three files will be unmerged.

The test which use a client, are normally the functional tests.

Yep, but not necessary. Instantiate client !== make request.

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