Remove unnecessary import

See gh-3335

Author: snicoll

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/LogFileMvcEndpointTests.java

@@ -21,7 +21,6 @@
 import java.io.InputStream;
 import java.io.InputStreamReader;
 
-import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;