[Merge] lp:~ogra/phablet-tools/phablet-config-fix-serial-vs-password into lp:phablet-tools

[Parameswaran Sivatharman]

Review: Approve

+1. making the image writeable works with this change. 
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https://code.launchpad.net/~ogra/phablet-tools/phablet-config-fix-serial-vs-password/+merge/233486
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~ogra/phablet-tools/phablet-config-fix-serial-vs-password into lp:phablet-tools.