Apply a fast invalidating cache to the ``iter_entry_points`` function.
Apply a fast invalidating cache to the ``iter_entry_points`` function.

When the salt loader is loading, this function is hit multiple times,
so we apply a 0.1 seconds cache to the function returns.
While loading, or reloading, it's very unlikely that a new salt
extension is installed, and this is also a very short timed cache,
so, loader performance is improved, but newly installed salt extensions
will still be detected.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt