Optimize imports

Author: civitaspo

src/main/java/org/embulk/output/sftp/SftpFileOutput.java

@@ -4,7 +4,6 @@
 import org.apache.commons.vfs2.FileObject;
 import org.apache.commons.vfs2.FileSystemException;
 import org.apache.commons.vfs2.FileSystemOptions;
-import org.apache.commons.vfs2.Selectors;
 import org.apache.commons.vfs2.impl.StandardFileSystemManager;
 import org.apache.commons.vfs2.provider.sftp.IdentityInfo;
 import org.apache.commons.vfs2.provider.sftp.SftpFileSystemConfigBuilder;