Revert "Don't die when daemon cannot read certs.d"

This reverts commit 2808762b27.

This exception was added for rootless mode, but superseded by the
follow-up commit f4fa98f583, which
uses a different path to look for the certs when running in rootless
mode

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

registry/registry.go

@@ -69,7 +69,7 @@ func hasFile(files []os.FileInfo, name string) bool {
 // provided TLS configuration.
 func ReadCertsDirectory(tlsConfig *tls.Config, directory string) error {
 	fs, err := ioutil.ReadDir(directory)
-	if err != nil && !os.IsNotExist(err) && !os.IsPermission(err) {
+	if err != nil && !os.IsNotExist(err) {
 		return err
 	}