Update power button handling for Stretch
I’m in 2.7 on a ThinkPad X201 and pressing the power button for 1 sec doesn’t do anything, neither trigger emergency shutdown, neither display a menu as I think it used to do on Tails < 2.0.
But sycamoreone says it’s working for him in 2.0 in #7334 (comment 103804).
So this probably happens on some computer but not on others.
My personal take is that I’m not sure it’s worth keeping this feature if it’s sometimes broken on some machines or complicated to fix.