Support message buffering before initial connect#286

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nofarius wants to merge 3 commits intoeclipse-paho:developfrom nofarius:msg_buffer_before_connect

+187-122

Commits on Jan 31, 2018

Re-applied message_buffering_before_connect changes
nofarius
committed

Commits on Feb 1, 2018

Reverted removal of clientHandle cleanup
nofarius
committed

Commits on Feb 2, 2018

Added enabling buffer option in sample app
nofarius
committed