Adding Settings for TLS and Username/Password to MQTT Example

[jpwsutton]

The mqtt-all.py example is really well put together. I've added the settings that enable TLS and Username / Password in case people would like to use this with their secure MQTT Brokers.
Example:
python3 mqtt-all.py --broker localhost --port 8883 --topic enviro --tls --username enviropi --password raspberry

[coveralls]

Pull Request Test Coverage Report for Build 1189850093

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.915%

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Totals
Change from base Build 512801398:	0.0%
Covered Lines:	112
Relevant Lines:	118

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💛 - Coveralls

[Gadgetoid]

If you're somehow still invested in this after counts on fingers ~6 months, could you rebase upon #92 please? Thank you!

[jpwsutton]

Thanks, done!

[Gadgetoid]

Thank you!