refact(dist): avoid script exit while restarting & clean script

[imbajin]

• fix "restart" not work in hugegraph script
• clean shell script to avoid error in high-version bash/sh

refer:

• https://github.com/koalaman/shellcheck/wiki/SC2181
• https://github.com/koalaman/shellcheck/wiki/SC2004

and we have a lot of writing way may break the shell rules, and it will lead some unexpected error in high bash/shell version (like the problem when start with java11)

[codecov]

Codecov Report

Merging #2041 (e948fe9) into master (927b673) will decrease coverage by 3.50%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2041      +/-   ##
============================================
- Coverage     65.89%   62.38%   -3.51%     
- Complexity      974      976       +2     
============================================
  Files           482      482              
  Lines         41458    41458              
  Branches       5889     5889              
============================================
- Hits          27319    25864    -1455     
- Misses        11437    13046    +1609     
+ Partials       2702     2548     -154     

Impacted Files	Coverage Δ
.../java/org/apache/hugegraph/version/ApiVersion.java	75.00% <ø> (ø)
...java/org/apache/hugegraph/version/CoreVersion.java	80.00% <ø> (ø)
...hugegraph/backend/store/raft/RaftStoreClosure.java	0.00% <0.00%> (-100.00%)	⬇️
...ugegraph/backend/store/rocksdb/RocksDBMetrics.java	0.00% <0.00%> (-85.87%)	⬇️
...gegraph/backend/store/rocksdb/RocksDBFeatures.java	4.16% <0.00%> (-83.34%)	⬇️
...pache/hugegraph/backend/store/raft/RaftResult.java	0.00% <0.00%> (-81.25%)	⬇️
...ache/hugegraph/backend/store/raft/RaftContext.java	0.00% <0.00%> (-80.96%)	⬇️
...hugegraph/backend/store/raft/RaftBackendStore.java	0.00% <0.00%> (-75.27%)	⬇️
...hugegraph/backend/store/raft/rpc/RpcForwarder.java	0.00% <0.00%> (-69.50%)	⬇️
.../backend/store/raft/rpc/StoreCommandProcessor.java	0.00% <0.00%> (-65.22%)	⬇️
... and 64 more

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[imbajin]

and I'll fix the script problem left in #2024 in next PR