Add relation between client cache and user’s token

[rodrigok]

Closes #5537

@RocketChat/core

[geekgonecrazy]

@rodrigok this looks good. What does doing this accomplish? Clears it out if the user logs out? Just making sure 😄

[rodrigok]

@geekgonecrazy Yes, it is relating the cache data with the user's token.

When cache is loading we compare the saved token with the current token, if the token is different we clear the cache and load all from database.

We are clearing the cache when users logout, but there is an edge case where the token expires and meteor does not remove the token (logout) and shows the login screen, with this change the cache will be cleared even if the logout does not do the work.

We are not enabling this relation for public-settings cuz it is the same for all users and for non logged users too.