Change the expiration behavior of sessionToken

See https://bugzilla.mozilla.org/show_bug.cgi?id=1022678

 - [ ] Store the last usage and the date of activation of a sessionToken
 - [x] Automatically prune ONE_DAY old not validated sessionToken
 - [ ] As soon as a sessionToken is validated store it in a long live storage
 - [ ] cleanSession should remove both redis and longStorage keys.

We will use redis for the validation flow and as soon as the MSISDN is validated, drop validation data and build a longlive database entry to store MSISDN, creation date and last update date
ah okay, then you probably want to automate that, nope? So you don't need to copy this for all the methods you want to call on all the storages.