[virt-operator]: Refactor - function to eliminate code plication
[virt-operator]: Refactor - function to eliminate code plication

Code to fetch annotations and check for their existance was
duplicated 5 times. Therefore it is now wrapped into a function
to eliminate the duplication.

Signed-off-by: Itamar Holder <b6ebf050aad0538d1e30c557853a5c8924b66230@redhat.com>

stu-gott/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt