Revert some core adjustments that were made for serverless

EndPoint fields are final again in Connection and Host classes.

Author: Bouncheck

clirr-ignores.xml

@@ -65,6 +65,16 @@
         <justification>Serverless was dropped. This code has no use anymore.</justification>
     </difference>
 
+    <difference>
+        <differenceType>7002</differenceType> <!-- method removed -->
+        <className>com/datastax/driver/core/Host</className>
+        <method>void setEndPoint(com.datastax.driver.core.EndPoint)</method>
+        <justification>Originally endPoint field was made non-final to work around serverless limitations.
+            We're making it final again for clarity. Driver always used to treat the EndPoint as something that
+            does not change for given Host outside that specific case.
+        </justification>
+    </difference>
+
     <difference>
         <differenceType>7004</differenceType> <!-- the number of arguments has changed -->
         <className>com/datastax/driver/core/Metadata</className>

driver-core/src/main/java/com/datastax/driver/core/Connection.java

@@ -127,7 +127,7 @@ enum State {
 
   volatile long maxIdleTime;
 
-  EndPoint endPoint;
+  final EndPoint endPoint;
   private final String name;
   private volatile Integer shardId = null;
 

driver-core/src/main/java/com/datastax/driver/core/ControlConnection.java

@@ -680,11 +680,6 @@ private static void updateInfo(
     }
     host.setHostId(row.getUUID("host_id"));
     host.setSchemaVersion(row.getUUID("schema_version"));
-
-    EndPoint endPoint = cluster.configuration.getPolicies().getEndPointFactory().create(row);
-    if (endPoint != null) {
-      host.setEndPoint(endPoint);
-    }
   }
 
   private static void updateLocationInfo(
@@ -816,8 +811,6 @@ private void refreshNodeListAndTokenMap(
           connection.endPoint);
     } else {
       updateInfo(controlHost, localRow, cluster, isInitialConnection);
-      connection.endPoint = controlHost.getEndPoint();
-
       if (metadataEnabled && factory != null) {
         Set<String> tokensStr = localRow.getSet("tokens", String.class);
         if (!tokensStr.isEmpty()) {

driver-core/src/main/java/com/datastax/driver/core/Host.java

@@ -43,7 +43,7 @@ public class Host {
   static final Logger statesLogger = LoggerFactory.getLogger(Host.class.getName() + ".STATES");
 
   // The address we'll use to connect to the node
-  private EndPoint endPoint;
+  private final EndPoint endPoint;
 
   // The broadcast RPC address, as reported in system tables.
   // Note that, unlike previous versions of the driver, this address is NOT TRANSLATED.
@@ -183,10 +183,6 @@ public EndPoint getEndPoint() {
     return endPoint;
   }
 
-  public void setEndPoint(EndPoint endPoint) {
-    this.endPoint = endPoint;
-  }
-
   /**
    * Returns the address that the driver will use to connect to the node.
    *