kubernetes-nmstate interprets interface names as float64 and subsequently crashes in OCP 4

Issue

• After deploying CNFs in our OpenShift 4.8.24 we still face the problem that interface names are understood as float64 and not strings
• Using Kubernetes-nmstate Operator configuration on an application, two interfaces were interpreted as float64 in two different namespaces

• Error in kubernetes nmstate-handler Pod logs:

  E0209 19:33:22.394992       1 runtime.go:78] Observed a panic: &runtime.TypeAssertionError{_interface:(*runtime._type)(0x14ca120), concrete:(*runtime._type)(0x1460040), asserted: 
  (*runtime._type). 
  (0x1483a00), missingMethod:""} (interface conversion: interface {} is float64, not string)
  goroutine 310 [running]:
  k8s.io/apimachinery/pkg/util/runtime.logPanic(0x15050c0, 0xc00010af90)
      /go/src/github.com/nmstate/kubernetes-nmstate/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:74 +0xa3
  k8s.io/apimachinery/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)