[#236] *: Notify user on success

Add notifications to:
- container put, delete, setEACL
- netmap addPeer, updateState

Because notifications are limited in size (currently arguments should be
less than 1024 bytes) provide only minimal information, such as entity
ID (container ID or node public key).

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

netmap/netmap_contract.go

@@ -202,6 +202,9 @@ func AddPeerIR(nodeInfo []byte) {
 	common.CheckAlphabetWitness(common.AlphabetAddress())
 
 	addToNetmap(ctx, storageNode{info: nodeInfo})
+
+	publicKey := nodeInfo[2:35] // V2 format: offset:2, len:33
+	runtime.Notify("AddPeerSuccess", interop.PublicKey(publicKey))
 }
 
 // AddPeer method adds new candidate to the next network map if it was invoked
@@ -225,12 +228,12 @@ func AddPeer(nodeInfo []byte) {
 		nodeKey = common.InnerRingInvoker(alphabet)
 	}
 
+	// V2 format
+	publicKey := nodeInfo[2:35] // offset:2, len:33
+
 	// If notary is enabled or caller is not an alphabet node,
 	// just emit the notification for alphabet.
 	if !notaryDisabled || len(nodeKey) == 0 {
-		// V2 format
-		publicKey := nodeInfo[2:35] // offset:2, len:33
-
 		common.CheckWitness(publicKey)
 		if notaryDisabled {
 			runtime.Notify("AddPeer", nodeInfo)
@@ -256,6 +259,7 @@ func AddPeer(nodeInfo []byte) {
 	}
 
 	addToNetmap(ctx, candidate)
+	runtime.Notify("AddPeerSuccess", interop.PublicKey(publicKey))
 }
 
 // UpdateState method updates state of node from the network map candidate list.
@@ -316,6 +320,8 @@ func UpdateState(state int, publicKey interop.PublicKey) {
 	default:
 		panic("unsupported state")
 	}
+
+	runtime.Notify("UpdateStateSuccess", publicKey, state)
 }
 
 // UpdateStateIR method tries to change node state in the network map.
@@ -335,6 +341,7 @@ func UpdateStateIR(state nodeState, publicKey interop.PublicKey) {
 	default:
 		panic("unsupported state")
 	}
+	runtime.Notify("UpdateStateSuccess", publicKey, state)
 }
 
 // NewEpoch method changes epoch number up to provided epochNum argument. Can