fix: extend metadata manager admin wait to 2m

Author: dkropachev

core/src/test/java/com/datastax/oss/driver/internal/core/metadata/MetadataManagerTest.java

@@ -528,6 +528,6 @@ public void removeNode(InetSocketAddress broadcastRpcAddress) {
 
   // Wait for all the tasks on the pool's admin executor to complete.
   private void waitForPendingAdminTasks(Callable<Boolean> condition) {
-    await().atMost(1, TimeUnit.MINUTES).until(condition);
+    await().atMost(2, TimeUnit.MINUTES).until(condition);
   }
 }