Fix naming for delay for draining the replication event queue

Thread.sleep() takes milliseconds as an argument, not seconds.
Otherwise, multiplying by 1000 would be a bug.

Also switches to returning a long, which fixes a potential overflow when
multiplying by 1000.

Change-Id: I3fc5c939e8c09c134e24fa9381e96e6529b5be4d
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/Destination.java b/src/main/java/com/googlesource/gerrit/plugins/replication/Destination.java
index 545b537..e057626 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/Destination.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/Destination.java
@@ -750,8 +750,8 @@
     return config.getDrainQueueAttempts();
   }
 
-  public int getReplicationDelaySeconds() {
-    return config.getDelay() * 1000;
+  public long getReplicationDelayMilliseconds() {
+    return config.getDelay() * 1000L;
   }
 
   private static boolean matches(URIish uri, String urlMatch) {
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java
index 68db6c6..37d63e3 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java
@@ -259,7 +259,7 @@
         logger.atInfo().log(
             "Draining replication events, postpone shutdown. Events left: inFlight %d, pending %d",
             inFlight, pending);
-        Thread.sleep(destination.getReplicationDelaySeconds());
+        Thread.sleep(destination.getReplicationDelayMilliseconds());
       } catch (InterruptedException ie) {
         logger.atWarning().withCause(ie).log(
             "Wait for replication events to drain has been interrupted");