yast2-update from YaST:SLE-12:SP1:Travis project

For xUbuntu 12.04 run the following:

Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).

echo 'deb http://download.opensuse.org/repositories/YaST:/SLE-12:/SP1:/Travis/xUbuntu_12.04/ /' | sudo tee /etc/apt/sources.list.d/YaST:SLE-12:SP1:Travis.list
curl -fsSL https://download.opensuse.org/repositories/YaST:SLE-12:SP1:Travis/xUbuntu_12.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/YaST_SLE-12_SP1_Travis.gpg > /dev/null
sudo apt update
sudo apt install yast2-update