umqtt.simple: refactor packet de/encoding and fix remaining length encoding (fixes #284)#303

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SpotlightKid wants to merge 3 commits intomicropython:masterfrom

SpotlightKid:bugfix/umqtt-fix-varlen

Commits on Aug 27, 2018

umqtt.simple: allow no password in connect packet
SpotlightKid
committed
umqtt.simple: refactor packet de/encoding and fix remaining length encoding (fixes #284)
SpotlightKid
committed
umqtt.simple: remove debug printing and add debug wrapper for MQTTClient which can optionally be used with examples
SpotlightKid
committed