satellite/nodeselection: introduce Name for Placements

This human readable name can be used in UI instead of the int identifier.

Same as the legacy 'Location' annotation, but we don't need annotations any more.

Change-Id: I0060a1a836e08e99b57c700fe165829650c2c044

satellite/nodeselection/placement.go

@@ -21,6 +21,8 @@ import (
 type Placement struct {
 	// the unique ID of the placement
 	ID storj.PlacementConstraint
+	// meaningful identifier/label for Humans. Will be used on UI.
+	Name string
 	// binding condition for filtering out nodes
 	NodeFilter NodeFilter
 	// selector is the method how the nodes are selected from the full node space (eg. pick a subnet first, and pick a node from the subnet)
@@ -35,7 +37,11 @@ func (p Placement) Match(node *SelectedNode) bool {
 }
 
 // GetAnnotation implements NodeFilterWithAnnotation.
+// Deprecated: use Name instead.
 func (p Placement) GetAnnotation(name string) string {
+	if name == Location && p.Name != "" {
+		return p.Name
+	}
 	switch filter := p.NodeFilter.(type) {
 	case NodeFilterWithAnnotation:
 		return filter.GetAnnotation(name)
@@ -301,6 +307,8 @@ func (d PlacementDefinitions) AddPlacementFromString(definitions string) error {
 			placement.Selector = RandomSelector()
 		}
 
+		placement.Name = GetAnnotation(placement.NodeFilter, Location)
+
 		d[storj.PlacementConstraint(id)] = placement
 	}
 	return nil