Docker and app fixes

[sajith]

Resolves #217. Changes:

• Use asgiref.wsgi.WsgiToAsgi adapter so that uvicorn runs correctly.
• Bind to 0.0.0.0:8080 rather than localhost:8080 so that the port is available outside of the container.
• Update README and comments.
• Add a redirect from "/" path to Swagger UI path, which seems like a sane default for now.

[coveralls]

Pull Request Test Coverage Report for Build 7750455298

• -9 of 9 (0.0%) changed or added relevant lines in 2 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 38.158%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
sdx_controller/init.py	0	1	0.0%
sdx_controller/app.py	0	8	0.0%
<!--	Total:	0	9	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
sdx_controller/app.py	2	0.0%
<!--	Total:	2		-->

Totals
Change from base Build 7715793051:	-0.2%
Covered Lines:	605
Relevant Lines:	1424

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💛 - Coveralls

[sajith]

does '1.0.0' mean anything? should it be version 2.0.0?

The API itself has not changed much, so I would think that it should remain 1.0.0. Those numbers indicate API version, not software version itself, in my mind.