[LightDM] lightdm 1.20 end of life

[Robert Ancell]

As previously discussed [1] LightDM 1.20 is no longer supported and will
receive no more updates. All users are encouraged to update to LightDM 1.22.

The currently supported releases will expire on:
1.22 - January 2018
1.10 - April 2019
1.18 - April 2021

--Robert

[1] https://lists.freedesktop.org/archives/lightdm/2016-October/001031.html
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