[ISSUE #257]Use thread name as rocksdb path

[ni-ze]

1. use the name of thread as rocksdb path;
2. clean the temporary data of rocksdb in local;
3. make WorkerThread shutdown method idempotent;

close #257

[codecov-commenter]

Codecov Report

Merging #256 (45f24e3) into develop (f499b19) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           develop    #256   +/-   ##
=======================================
  Coverage     0.00%   0.00%           
=======================================
  Files           79      79           
  Lines         2640    2646    +6     
  Branches       250     252    +2     
=======================================
- Misses        2640    2646    +6     

Impacted Files	Coverage Δ
.../apache/rocketmq/streams/core/common/Constant.java	0.00% <ø> (ø)
...he/rocketmq/streams/core/running/WorkerThread.java	0.00% <0.00%> (ø)
...ache/rocketmq/streams/core/state/RocksDBStore.java	0.00% <0.00%> (ø)

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