L4 controller references cache objects

[aojea]

It seems that the controller build new objects that reference the existing object of the cache, I don't understand well enough to know if this is on. purpose, but it is risky since the cache is shared and I find very brittle if this new object works on a reference to the cache, maybe is safer to deepcopy the Service

ingress-gce/pkg/l4lb/l4controller.go

Lines 230 to 238 in 0a822cc

	// Use the same function for both create and updates. If controller crashes and restarts,
	// all existing services will show up as Service Adds.
	l4ilbParams := &loadbalancers.L4ILBParams{
	Service: service,
	Cloud: l4c.ctx.Cloud,
	Namer: l4c.namer,
	Recorder: l4c.ctx.Recorder(service.Namespace),
	DualStackEnabled: l4c.enableDualStack,
	}

ingress-gce/pkg/l4lb/l4netlbcontroller.go

Lines 581 to 588 in 0a822cc

	l4NetLBParams := &loadbalancers.L4NetLBParams{
	Service: svc,
	Cloud: lc.ctx.Cloud,
	Namer: lc.namer,
	Recorder: lc.ctx.Recorder(svc.Namespace),
	DualStackEnabled: lc.enableDualStack,
	}
	l4netLB := loadbalancers.NewL4NetLB(l4NetLBParams)

/kind bug
/assign @cezarygerard @panslava