Support for UNLINK RENAME MULTI EXEC DISCARD and SCAN commands

[ErikOne]

Hi

would it be possible to add support for the commands I've listed in the title ?

Thanks

[zuiderkwast]

Hi Erik. It is already possible to do these things using the "Low-level API for sending commands to specific node".

cluster_node *redisClusterGetNodeByKey(redisClusterContext *cc, char *key);
void *redisClusterCommandToNode(redisClusterContext *cc, cluster_node *node,
                                const char *format, ...);

It's not enough documented though. We would appreciate an example of for example SCAN in the README.

For UNLINK and RENAME, I think it's strait-forward to add support in the normal APIs. A PR is welcome.

There is a draft PR for MULTI-EXEC-DISCARD which stores the slot for a transaction. I think WATCH-UNWATCH should be handled in the same way. If you have suggestions for how to do this, let's discuss it in #5.