优化适配gbase8s

[cqliulingbo]

修改一下gbase8s数据库getDbTypeRaw的问题

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 59.92%. Comparing base (f722a6e) to head (958b1f8).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/main/java/com/alibaba/druid/util/JdbcUtils.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6386   +/-   ##
=========================================
  Coverage     59.91%   59.92%           
+ Complexity    30062    30061    -1     
=========================================
  Files          1493     1493           
  Lines        135804   135807    +3     
  Branches      25161    25162    +1     
=========================================
+ Hits          81372    81376    +4     
+ Misses        44007    44005    -2     
- Partials      10425    10426    +1     

Files with missing lines	Coverage Δ
core/src/main/java/com/alibaba/druid/DbType.java	90.62% <100.00%> (+0.09%)	⬆️
...rc/main/java/com/alibaba/druid/util/JdbcUtils.java	52.69% <0.00%> (-0.18%)	⬇️

... and 3 files with indirect coverage changes

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