[Merge] lp:~jamesodhunt/goget-ubuntu-touch/record-sideload into lp:goget-ubuntu-touch

[James Hunt]

James Hunt has proposed merging lp:~jamesodhunt/goget-ubuntu-touch/record-sideload into lp:goget-ubuntu-touch.

Commit message:
* Record sideloads to ensure "snappy update" doesn't try to upgrade a system that uses custom assets.

Requested reviews:
  PS Jenkins bot (ps-jenkins): continuous-integration
  Sergio Schvezov (sergiusens)

For more details, see:
https://code.launchpad.net/~jamesodhunt/goget-ubuntu-touch/record-sideload/+merge/256190

* Record sideloads to ensure "snappy update" doesn't try to upgrade a system that uses custom 
  assets.

Creates a stamp file on the writable partition when --device-part= is specified. This is clearly trivial to defeat, but will allow snappy to refuse to update a system with such a stamp file.

There is a potential gotcha with this approach (albeit unlikely for anyone to hit it): if u-d-f is used to first download the set of s-i tar files and then u-d-f is called again with --device-part= pointing to the valid, official device part just downloaded, the stamp will still be created.


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