[Merge] lp:~morphis/goget-ubuntu-touch/add-turbo-bootstrap-support into lp:goget-ubuntu-touch

[Simon Fels]

Simon Fels has proposed merging lp:~morphis/goget-ubuntu-touch/add-turbo-bootstrap-support into lp:goget-ubuntu-touch.

Commit message:
Add bootstrap support for turbo device

The bootloader on turbo does not have support for fastboot format <partition>
or fastboot boot <image>. Therefor we have to workaround this by using a OEM
specific bootloader command to reboot into recovery and a new command in
system-image-upgrader to format the cache partition. The new command
"format cache" will do an rm -rf /cache but will exclude all files on /cache/recovery
as that is where we store OTA updates, a SWAP file etc.

Adding this new command doesn't cause harm for any other device as the
system-image-upgrader script will just warn for an unknown command but
not fail.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~morphis/goget-ubuntu-touch/add-turbo-bootstrap-support/+merge/291583

Corresponding MP for turbo to add the new "format cache" command can be found at https://code.launchpad.net/~morphis/zhongshan/+git/platform_bootable_recovery/+merge/291582

Opened this for a first discussion if we want to add device specific quirks this way.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~morphis/goget-ubuntu-touch/add-turbo-bootstrap-support into lp:goget-ubuntu-touch.
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