bugfix : use xid wrong when do branch commit and rollback

[zhangthen]

fix #1118

Use the xid wrong when do branch commit and rollback.

[codecov-io]

Codecov Report

Merging #1120 into develop will decrease coverage by <.01%.
The diff coverage is 50%.

@@              Coverage Diff              @@
##             develop    #1120      +/-   ##
=============================================
- Coverage      41.83%   41.82%   -0.01%     
  Complexity      1361     1361              
=============================================
  Files            243      243              
  Lines          10141    10141              
  Branches        1325     1325              
=============================================
- Hits            4242     4241       -1     
  Misses          5351     5351              
- Partials         548      549       +1

Impacted Files	Coverage Δ	Complexity Δ
...o/seata/server/coordinator/DefaultCoordinator.java	33.86% <0%> (ø)	13 <0> (ø)	⬇️
.../java/io/seata/server/coordinator/DefaultCore.java	57.41% <100%> (ø)	24 <0> (ø)	⬇️
...server/store/file/FileTransactionStoreManager.java	45.99% <0%> (-0.35%)	19% <0%> (ø)

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[slievrly]

Standalone is normal, this problem occurs with stateless clusters？XID.generateXID dependent on localIp

[zhangthen]

Standalone is normal, this problem occurs with stateless clusters？XID.generateXID dependent on localIp

It occur when transaction start on one server, and commit on another server.

[slievrly]

LGTM

[xingfudeshi]

LGTM