improvements to eni rendering

Some improvements here, and some bug fixes.
 - bring curtin revno 394's to support post-up for interface aliases.
 - sort attributes per interface for nicer order and consistent rendering
 - use arrays for each 'section' rather than content += . This allows
   better separation of the sections and also will perform better as long
   strings with += are slow.
 - improve how 'lo' is handled. If a network state that was being rendered
   had an entry for 'lo', then the rendered ENI would have 2 'lo'
   sections.
 - no longer skip 'lo' sections when loading an ENI in parse_deb_config
 - fix inet value for subnets, don't add interface attributes to alias
   (LP: #1588547)

Also add some tests of reading yaml and rendering ENI.

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