Scripting: Use faster API for Lua client c->argv creation.
Scripting: Use faster API for Lua client c->argv creation.

Replace the three calls to Lua API lua_tostring, lua_lua_strlen,
and lua_isstring, with a single call to lua_tolstring.

~ 5% consistent speed gain measured.

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