Description of problem: Installing task-plasma5-minimal does not give functional plasma5 desktop


Version-Release number of selected component (if applicable):5.0.1-4.mga5


How reproducible: 


Steps to Reproduce:
1. Make a Mageia 5 alpha 2 or Cauldron network minimal install with X
2. Install task-plasma5-minimal
3. Try to start Plasma desktop from display manager
4. The result is black screen with mouse cursor

However, if you look at Mageia 5 errata: https://wiki.mageia.org/en/Mageia_5_Errata#KDE , then there is an urpmi command to install a Plasma5 desktop. Running that command indeed gives working Plasma5 desktop. Packages in that selection, that are not as dependencies in task-plasma5-minimal are:
dbus-x11
plasma-workspace-wallpapers
xinit
xauth
socat

So I guess these packages should be added as a dependencies to task-plasma5-minimal.

Also I'd suggest to add there:
kio-extras (without that you do not see wallpaper previews when you right-click to the desktop and select Desktop settings)
plasma5-konsole
powerdevil

PS Any chance, that we get Plasma 5.1 into Cauldron before Mageia 5?



Reproducible: 

Steps to Reproduce: