Changed tutorial bitcoin config file to work with new core v0.17 format#454

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instagibbs merged 2 commits intoElementsProject:elements-0.14.1from

wintercooled:elements-0.14.1

Nov 2, 2018

Commits on Nov 1, 2018

Changed config file to work with new core v0.17 format as well as previous versions
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Removed redundant .rpcuser, .rpcpassword
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