dnm: Use multus as primary interface

[qinqon]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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[coveralls]

Pull Request Test Coverage Report for Build 3295187067

• 43 of 80 (53.75%) changed or added relevant lines in 7 files are covered.
• 287 unchanged lines in 9 files lost coverage.
• Overall coverage remained the same at 51.459%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/kubevirt/utils.go	13	15	86.67%
pkg/ssh/ssh_command_executor.go	0	4	0.0%
pkg/kubevirt/machine.go	18	23	78.26%
controllers/kubevirtcluster_controller.go	2	10	20.0%
api/v1alpha1/zz_generated.deepcopy.go	0	18	0.0%
<!--	Total:	43	80	53.75%	-->

Files with Coverage Reduction	New Missed Lines	%
pkg/kubevirt/machine_factory.go	2	0%
pkg/infracluster/infracluster.go	5	87.23%
api/v1alpha1/kubevirtcluster_types.go	6	33.33%
pkg/kubevirt/utils.go	9	81.58%
pkg/ssh/ssh_command_executor.go	9	0%
pkg/kubevirt/machine.go	24	62.58%
controllers/kubevirtcluster_controller.go	43	44.91%
api/v1alpha1/zz_generated.deepcopy.go	79	0%
controllers/kubevirtmachine_controller.go	110	62.65%
<!--	Total:	287		-->

Totals
Change from base Build 3292711062:	0.0%
Covered Lines:	952
Relevant Lines:	1850

---

💛 - Coveralls