virt-handler: Use unauthenticated connection if no user is given
virt-handler: Use unauthenticated connection if no user is given

Fixes #32

sungwonh/kubevirt,admiyo/kubevirt,davidvossel/kubevirt,fabiand/kubevirt,stu-gott/kubevirt,fabiand/kubevirt,mpolednik/kubevirt,kubevirt/kubevirt,rmohr/kubevirt,davidvossel/kubevirt,rmohr/kubevirt,mpolednik/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,admiyo/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,sungwonh/kubevirt