Bug 1093951 - Entering wifi power save mode when screen off. r=alive

While screen is off, wifi would go to power save mode only
when wifi lock is held. If wifi lock is not held, wifi would
stay on and be turned off after |wifi.screen_off_timeout|.
We can more aggressively request the wifi driver to enter
power save mode before timed out. This is what the patch
intends to do.
Bug 1100806 - Implement a taskgraph just for autolander r=lightsofapollo
Merge pull request #26227 from KevinGrandon/bug_1100806_autolander_graph

Bug 1100806 - Implement a taskgraph just for +autolander
Merge pull request #26102 from elefant/bug/1093951-wifi-powersave-master

Bug 1093951 - Entering wifi power save mode when screen off. r=alive
Bug 1097296 - [Window Management] Battery, Signal and time on the status bar will appear behind download update overlay. r=etienne