Remove confusing message about symlinks (#381)

pkg/container/docker_run.go

@@ -418,7 +418,7 @@ func (cr *containerReference) copyDir(dstPath string, srcPath string) common.Exe
 			// copy file data into tar writer
 			if _, err := io.Copy(tw, f); err != nil {
 				if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
-					logger.Warnf("Unable to copy link %s --> %s", fi.Name(), linkName)
+					// symlinks don't need to be copied, ignore this error
 					err = nil
 				}
 				return err