cleanup unused imports

Signed-off-by: Olivier Lamy <olamy@apache.org>

Author: olamy

src/main/java/com/cloudbees/jenkins/plugins/sshcredentials/SSHUserPrivateKey.java

@@ -26,10 +26,6 @@
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import hudson.util.Secret;
-import org.kohsuke.accmod.Restricted;
-import org.kohsuke.accmod.restrictions.NoExternalUse;
-
-import java.io.IOException;
 import java.util.List;
 
 /**

src/main/java/com/cloudbees/jenkins/plugins/sshcredentials/impl/BasicSSHUserPrivateKey.java

@@ -29,7 +29,6 @@
 import edu.umd.cs.findbugs.annotations.NonNull;
 import hudson.DescriptorExtensionList;
 import hudson.Extension;
-import hudson.ExtensionList;
 import hudson.model.AbstractDescribableImpl;
 import hudson.model.Descriptor;
 import hudson.model.Items;