Ambiguous error when creating a VM app without any ports

[levshvarts]

When we create a VM app instance for an app that has no ports, we will fail to create one, due to lack of StaticUri on the App:

edge-cloud-platform/pkg/controller/appinst_api.go

Line 418 in d290e08

if app.InternalPorts || len(ports) == 0 {

Since when we create load balancer VM for the VM App, we expect there to be staticUri in order to name the VM, but in this case it's empty:

edge-cloud-platform/pkg/platform/common/vmlayer/appinst.go

Line 134 in d290e08

orchVals.lbName = appInst.StaticUri

To fix, we should disallow a creation of an VM App without any ports, or not create a load balancer VM in case there are no public ports(though we need to think about the reason behind such app.)