mmaprototype: remove RemoveNodeAndStores

It is unused and unclear what it would be used for.
Easy to re-add should a need emerge.

Author: tbg

pkg/kv/kvserver/allocator/mmaprototype/allocator.go

@@ -39,10 +39,6 @@ type Allocator interface {
 	// about the nodes in the cluster is a side effect of this method.
 	SetStore(store StoreAttributesAndLocality)
 
-	// RemoveNodeAndStores tells the allocator to remove the NodeID and all its
-	// stores.
-	RemoveNodeAndStores(nodeID roachpb.NodeID) error
-
 	// ProcessStoreLoadMsg provides frequent the state of every store and its
 	// associated node in the cluster.
 	ProcessStoreLoadMsg(ctx context.Context, msg *StoreLoadMsg)

pkg/kv/kvserver/allocator/mmaprototype/allocator_state.go

@@ -808,13 +808,6 @@ func (a *allocatorState) SetStore(store StoreAttributesAndLocality) {
 	a.cs.setStore(store)
 }
 
-// RemoveNodeAndStores implements the Allocator interface.
-func (a *allocatorState) RemoveNodeAndStores(nodeID roachpb.NodeID) error {
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	panic("unimplemented")
-}
-
 // ProcessStoreLeaseholderMsg implements the Allocator interface.
 func (a *allocatorState) ProcessStoreLoadMsg(ctx context.Context, msg *StoreLoadMsg) {
 	a.mu.Lock()