simplify structure of Deployer

- remove unused ActorDeployer trait
- put everything in one class with simple initialization structure and
  one protected method to override for adaptations
- adapt RemoteDeployer accordingly
- change “remote” key to directly contain the single remote address,
  since there is nothing else to configure
- adapt test cases accordingly

akka-remote/src/main/scala/akka/remote/RemoteInterface.scala

@@ -29,6 +29,19 @@ object RemoteAddress {
     case RE(sys, host, Int(port)) ⇒ apply(if (sys != null) sys else defaultSystem, host, port)
     case _                        ⇒ throw new IllegalArgumentException(stringRep + " is not a valid remote address [system@host:port]")
   }
+
+}
+
+object RemoteAddressExtractor {
+  def unapply(s: String): Option[RemoteAddress] = {
+    try {
+      val uri = new URI("akka://" + s)
+      if (uri.getScheme != "akka" || uri.getUserInfo == null || uri.getHost == null || uri.getPort == -1) None
+      else Some(RemoteAddress(uri.getUserInfo, uri.getHost, uri.getPort))
+    } catch {
+      case _: URISyntaxException ⇒ None
+    }
+  }
 }
 
 case class RemoteAddress(system: String, host: String, ip: InetAddress, port: Int) extends Address {