Organized imports for main classes

Change-Id: I3b05d7f289706aef04019a820be9989f8fb54945
diff --git a/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java b/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java
index 194935c..4a21cad 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java
@@ -8,13 +8,13 @@
 import java.util.concurrent.Delayed;
 import java.util.concurrent.TimeUnit;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import net.floodlightcontroller.core.IFloodlightProviderService.Role;
 import net.floodlightcontroller.core.IOFSwitch;
 import net.floodlightcontroller.core.annotations.LogMessageDoc;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /** 
  * This class handles sending of RoleRequest messages to all connected switches.
  *