Description of problem: Since multiple queues per vnic is now supported, enable it as default for High Performance VM type.
This fix was already merged to master in patch: https://gerrit.ovirt.org/#/c/92988/ I opened this BZ just for backporting.
Verified on upstream ovirt-release42-snapshot-4.2.6-0.3.rc3.20180826015005.git2aa33d5.el7.noarch and downstream rhv-release-4.2.6-4-001.noarch. Automation tests created https://code.engineering.redhat.com/gerrit/#/c/148591/. cases 25904-25906 in https://polarion.engineering.redhat.com/polarion/#/project/RHEVM3/wiki/Compute/4_2_VIRT_High_Perfomance_VM