luazmq_skt_setopt_* functions make a mistake getting option_value

[evanchen]

lua use case:
socket,err = self.ctx:socket(zmq.XREQ)
assert(socket,err)
socket:setopt_int(zmq.SNDTIMEO,1000)
but the option value 1000 doesn't work.

please have a look at the codes below,
...
{"setopt_int", luazmq_skt_setopt_int },
...
static int luazmq_skt_setopt_int(lua_State *L){ return luazmq_skt_set_int(L, luaL_checkint(L,2)); }
...
static int luazmq_skt_set_int (lua_State *L, int option_name) {
zsocket *skt = luazmq_getsocket(L);
int option_value = luaL_checkint(L, 2);
int ret = zmq_setsockopt(skt->skt, option_name, &option_value, sizeof(option_value));
...
}

the paramter "option_value" is just the same as "option_name", because they're the same stack 2 of lua_State, it seems definitely a bug to me. so as the other functions,
luazmq_skt_set_i64
luazmq_skt_set_u64
luazmq_skt_set_str

the "option_value" should be the return value of "luaL_checkint(L, 3);"

[moteus]

This is bug, but your fix is not correct.
Need create separate function to set arbitrary option.
You can use set_sndtimeo function

[evanchen]

@moteus thanks