Issue: the yast2-vm package is no longer recommended by base Yast pattern, but
by KVM tools pattern.

Effect: this makes the Yast Virtualization module no longer present by default,
which can present an initial issue for users who prefer this way to install
virtualization stuff.
Perhaps not too big of an issue: one just needs to manually install yast2-vm
package.
However it does represent an additional previous step, even if small. Besides,
the fact that this package is now only recommended by KVM tools pattern makes
it totally redundant, since installing the KVM tools package pulls the entire
KVM Server pattern anyways.
(What if user wants just Xen or other technology instead of KVM?)

Steps to reproduce: make a clean installation of openSUSE Leap 15.0; do "zypper
up" just in case. In Yast, the Virtualization module is absent.