DOC(TESTING) - Add functional tests

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## Functional tests

Functional tests are located in the `tests/functional` directory.

### Architecture

* Kinetic Device simulator `tests/dependencies`

  - TCP connection

  - JAVA simulator

  - maven is needed for the build

    - Download : https://maven.apache.org/download.cgi

    - Installation guide : https://maven.apache.org/install.html

* mocha

### Method

Test are run by:

* lauching the Makefile located in the tests/functional directory :

  - make submodule_sync

    - sync and load the dependencies (simulator package)

  - make build_cache

    - build the simulator package with cache rule for avoiding many downloads

      and builds

  - make start_simulator

    - start the simulator

  - make stop_simulator

    - stop the simulator

  - make run_test

    - run the tests with mocha (`tests/functional/simulTest.js`)

  - can use make for an automatic load

### Functions tested

* Kinetic

  - Build (kinetic compatibility)

    - Protobuf message

    - Buffer sent format

  - Parse

    - Decode the received buffer

    - Check Version

    - HmacIntegrity

      (compute an HMAC from the PDU and compare it to the one sent)

  - Send()

    - Check the simulator returns (SUCCESS)

    - The simulator check the HMAC(integrity of PDU sent)