removed unnecessary imports

core/src/main/java/hudson/tools/JDKInstaller.java

@@ -42,7 +42,6 @@ import hudson.remoting.Callable;
 import hudson.util.ArgumentListBuilder;
 import hudson.util.FormValidation;
 import hudson.util.HttpResponses;
-import hudson.util.IOException2;
 import hudson.util.Secret;
 import jenkins.model.Jenkins;
 import net.sf.json.JSONObject;

test/src/test/java/hudson/tools/JDKInstallerTest.java

@@ -2,7 +2,6 @@ package hudson.tools;
 
 import com.gargoylesoftware.htmlunit.html.HtmlForm;
 import com.gargoylesoftware.htmlunit.html.HtmlPage;
-import hudson.model.Descriptor;
 import hudson.model.DownloadService;
 import hudson.tools.JDKInstaller.DescriptorImpl;
 import org.jvnet.hudson.test.HudsonTestCase;