Refactor rancher1_api module

This rewrite enables to add easier more features supported by the rancher
API. The initial idea of a simple get and set through the JSON REST API
is not feasible. To achieve something with the API one may have to setup
more options on different URLs and in a particular order. For this reason
the module comes with the mechanism of "modes", which is a wrapper around
some feature in the rancher and which can require multiple steps to do.

Rancher1_api module could also support "raw" mode where the user will not
be limited by a few implemented modes in the module, but he can craft all
requests by hand - but due to the fact that such thing can be done easily
with just curl command and ansible shell module, there is no benefit in
doing so. Especially when rancher 1.6 is already obsoleted within the ONAP.

The useful value of this module is to give the user a simple means to set
something in the rancher and hide all the boilerplate from him via a mode.

- Original logic was rewritten to utilize the "mode" mechanism.
- New module structure is also easier to test outside of ansible.

Issue-ID: OOM-1681
Change-Id: I0e7932199df9ec1acd80af545060199867ad17fa
Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>

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