Redis capability to add diverse TTL

[jeremymills]

Currently, it seems the capability to set a TTL on an item in Redis is on instantiation as a set configuration value.

As redis has the ability to be used as a database, or cache. I believe the ability to set the TTL on item creation should be implemented.

For example in addItem(s) a new parameter $ttl = null could be appended on and default to the base $options->getTtl()

protected function internalSetItem(& $normalizedKey, & $value, $tt = NULL)
    {
        $redis   = $this->getRedisResource();
        $options = $this->getOptions();
        $ttl     = $ttl ?: $options->getTtl();

        ...

This will allow the ability to diversify the Redis adapter as a database AND cache storage, instead of one OR the other.

[jeremymills]

Had a hard time finding adapter options setTtl (my bad) deleting this issue