Scripting test: check that Lua can call commands rewirting argv.
Scripting test: check that Lua can call commands rewirting argv.

SPOP, tested in the new test, is among the commands rewritng the
client->argv argument vector (it gets rewritten as SREM) for command
replication purposes.

Because of recent optimizations to client->argv caching in the context
of the Lua internal Redis client, it is important to test for SPOP to be
callable from Lua without bad effects to the other commands.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis