* Adding slx_command module and supporting module_utils.
This commit adds the slx_command module and tests as well as the
required slxos module_utils.
* Update copyright in header
* Adding missing module init
* Cleaning up shebangs/licensing.
* Incorporating feedback
Removing reference to `waitfor` alias in `slxos_command` module.
Adding `Extreme Networks` to `short_description` of `slxos_command` module.
* Adding cliconf tests
* Fixing 3.X tests
* Adding docstrings to test methods for slxos cliconf tests
* Adding slxos terminal tests
* Adding slxos module_utils tests
* Adding Extreme Networks team members to BOTMETA.yml
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