[amber] Rephrase update failed message

When no update is found for a package, instead of logging this as an
"error", state more neutrally that an update could not be found. This
will happen if a component is started in auto_update_packages and no
package server is running.

TESTED=observed log message

Change-Id: I599a69f7efa55618829367c585ed0f03c22a4961
1 file changed