let spring configure logback shutdown hook

Author: rfresh2

src/main/resources/logback.xml

@@ -1,7 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <configuration scan="true">
-    <shutdownHook/>
-
     <!-- Logs we care about -->
     <logger name="io.netty" level="INFO"/>
     <logger name="reactor" level="INFO"/>