* Ansible 2.3 feature support for dellos6.
- With the new Ansible 2.3 infra changes, the dellos modules doesn't work
(the new infra changes are not backward compatible), so added the below
changes support it.
- Added the new terminal plugin for DellOS6
- Added the new action plugin for DellOS6
- Modified the modules to work with the new infra.
- with that it adds support for DellOS6 Persistent Connection support.
* Remove pep8 confirming files from dellos6.py and dellos6_config legacy-files
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