bugfix: modify default namespace

[slievrly]

Ⅰ. Describe what this PR did

bugfix: modify default namespace

Ⅱ. Does this pull request fix one issue?

fix #1592

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1594 into develop will decrease coverage by 0.04%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #1594      +/-   ##
=============================================
- Coverage       46.4%   46.35%   -0.05%     
+ Complexity      1691     1690       -1     
=============================================
  Files            348      348              
  Lines          12723    12723              
  Branches        1588     1588              
=============================================
- Hits            5904     5898       -6     
- Misses          6183     6186       +3     
- Partials         636      639       +3

Impacted Files	Coverage Δ	Complexity Δ
...server/store/file/FileTransactionStoreManager.java	45.99% <0%> (-1.4%)	19% <0%> (ø)
...o/seata/server/coordinator/DefaultCoordinator.java	50.45% <0%> (-0.92%)	26% <0%> (-1%)

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[jsbxyyx]

LGTM

[xingfudeshi]

LGTM

[zjinlei]

LGTM