Support spop

[absolute8511]

spop support and fix hscan returns.

[codecov]

Codecov Report

Merging #49 into master will increase coverage by 0.01%.
The diff coverage is 39.34%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   44.56%   44.58%   +0.01%     
==========================================
  Files         149      149              
  Lines       21796    21856      +60     
==========================================
+ Hits         9714     9744      +30     
- Misses      10479    10501      +22     
- Partials     1603     1611       +8

Impacted Files	Coverage Δ
rockredis/scan.go	23.77% <0%> (-0.1%)	⬇️
node/node_cmd_reg.go	98.93% <100%> (+0.01%)	⬆️
node/set.go	40.42% <26.08%> (-13.75%)	⬇️
rockredis/t_set.go	57% <81.81%> (+0.77%)	⬆️
node/ttl.go	35.15% <0%> (ø)	⬆️
node/raft.go	36.06% <0%> (+0.27%)	⬆️
transport/rafthttp/stream.go	80.13% <0%> (+1.62%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b85f64a...ae9f56a. Read the comment docs.