[Merge] lp:~mterry/ubuntu-touch-session/session-lightdm into lp:ubuntu-touch-session

[Michael Terry]

Michael Terry has proposed merging lp:~mterry/ubuntu-touch-session/session-lightdm into lp:ubuntu-touch-session.

Commit message:
Allow unity8 session to connect to LightDM for its authentication.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~mterry/ubuntu-touch-session/session-lightdm/+merge/300224

This lets unity8 use a new LightDM feature to connect to it inside a user session for use in the session's lockscreen.

Since this requires a backported lightdm, I've also updated the config a bit.  Use the new Seat:* syntax and drop the deprecated unity seat type.  Now the local seat type can handle mir sessions as well.

See https://code.launchpad.net/~mterry/unity8/session-lightdm/+merge/300072 for the unity8-side of this change.

(And similar config change in https://code.launchpad.net/~mterry/unity8-desktop-session/session-lightdm/+merge/300129.)

You can test this from this silo:
https://bileto.ubuntu.com/#/ticket/1679
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~mterry/ubuntu-touch-session/session-lightdm into lp:ubuntu-touch-session.
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