[keycloak-dev] User SPI cache policies

You can now define cache policies per UserStorageProvider. * NO_CACHE - don't cache users loaded from this provider * MAX_LIFESPAN - max lifespan of user in cache * EVICT_DAILY - specify a time of day when the cache will be expired every day. * EVICT_WEEKLY - specify a day of the week and time of day when the cache will be expired. Bill