修复OceanBase validateQuery问题

[PeppaO]

druid通过jdbc前缀来区分是mysql租户还是oracle租户这种方式是不准确的，因为oceanbase官方给的是两种租户都可以采用jdbc:oceanbase://host:port方式进行连接，所以当我采用这种方式的时候，druid就会报错

[PeppaO]

Caused by: java.sql.SQLException: ORA-00900: You have an error in your SQL syntax; check the manual that corresponds to your OceanBase version for the right syntax to use near ''x'' at line 1

[PeppaO]

已测试通过

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.93%. Comparing base (118c21c) to head (aad1826).
Report is 878 commits behind head on master.

Files with missing lines	Patch %	Lines
...d/pool/vendor/OceanBaseValidConnectionChecker.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4967   +/-   ##
=========================================
  Coverage     58.93%   58.93%           
- Complexity    26908    26910    +2     
=========================================
  Files          1268     1268           
  Lines        122755   122752    -3     
  Branches      23123    23122    -1     
=========================================
  Hits          72350    72350           
+ Misses        41385    41383    -2     
+ Partials       9020     9019    -1     

Files with missing lines	Coverage Δ
...d/pool/vendor/OceanBaseValidConnectionChecker.java	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

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[wenshao]

https://github.com/alibaba/druid/releases/tag/1.2.14
请用新版本