test: enhance test coverage of seata common

[EZKAYOTWJPRKXWCUYEEB]

Ⅰ. Describe what this PR did

Enhance the test coverage of seata-common module.

Ⅱ. Does this pull request fix one issue?

It's a partial fix of #187 .

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Run tests and coverage of seata-common module.

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #2007 into develop will increase coverage by 0.23%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2007      +/-   ##
=============================================
+ Coverage      55.34%   55.58%   +0.23%     
- Complexity      2506     2522      +16     
=============================================
  Files            445      445              
  Lines          14838    14838              
  Branches        1749     1749              
=============================================
+ Hits            8212     8247      +35     
+ Misses          5863     5827      -36     
- Partials         763      764       +1

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/seata/server/session/GlobalSession.java	84.54% <0%> (-0.49%)	67% <0%> (-1%)
...o/seata/server/coordinator/DefaultCoordinator.java	48.01% <0%> (-0.4%)	27% <0%> (-1%)
...server/store/file/FileTransactionStoreManager.java	56.5% <0%> (+0.31%)	29% <0%> (ø)	⬇️
...eata/common/exception/EurekaRegistryException.java	100% <0%> (+100%)	4% <0%> (+4%)	⬆️
...io/seata/common/exception/DataAccessException.java	100% <0%> (+100%)	6% <0%> (+6%)	⬆️
...a/common/exception/ShouldNeverHappenException.java	100% <0%> (+100%)	4% <0%> (+4%)	⬆️
...seata/common/exception/NotSupportYetException.java	100% <0%> (+100%)	4% <0%> (+4%)	⬆️

[zjinlei]

add Copyright on new Classes

[EZKAYOTWJPRKXWCUYEEB]

add Copyright on new Classes

resolved

[zjinlei]

LGTM

[xingfudeshi]

LGTM.