bugfix: restore autocommit

[zjinlei]

Ⅰ. Describe what this PR did

apache/incubator-seata-samples#226
After the connection is used, restore the commit status of the initial connection.

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[slievrly]

LGTM

[codecov-io]

Codecov Report

Merging #1666 into develop will increase coverage by 0.14%.
The diff coverage is 25%.

@@              Coverage Diff              @@
##             develop    #1666      +/-   ##
=============================================
+ Coverage      47.22%   47.36%   +0.14%     
+ Complexity      1778     1777       -1     
=============================================
  Files            362      362              
  Lines          13127    13165      +38     
  Branches        1590     1632      +42     
=============================================
+ Hits            6199     6236      +37     
- Misses          6242     6254      +12     
+ Partials         686      675      -11

Impacted Files	Coverage Δ	Complexity Δ
.../rm/datasource/undo/mysql/MySQLUndoLogManager.java	2.96% <0%> (-0.1%)	2 <0> (ø)
...m/datasource/undo/oracle/OracleUndoLogManager.java	3.05% <0%> (-0.1%)	2 <0> (ø)
...a/io/seata/core/store/db/LockStoreDataBaseDAO.java	52.9% <50%> (-0.11%)	20 <1> (ø)
...ta/rm/datasource/exec/AbstractDMLBaseExecutor.java	71.87% <0%> (-1.66%)	6% <0%> (-1%)
...in/java/io/seata/server/session/GlobalSession.java	84.54% <0%> (-0.61%)	67% <0%> (ø)
...a/io/seata/core/rpc/netty/AbstractRpcRemoting.java	9.95% <0%> (-0.21%)	3% <0%> (ø)
...n/java/io/seata/rm/datasource/ConnectionProxy.java	22.88% <0%> (-0.2%)	10% <0%> (ø)
...tobuf/convertor/BranchCommitResponseConvertor.java	97.43% <0%> (+0.06%)	3% <0%> (ø)	⬇️
...in/java/io/seata/server/session/BranchSession.java	78.19% <0%> (+0.07%)	41% <0%> (ø)	⬇️
...buf/convertor/BranchRollbackResponseConvertor.java	97.36% <0%> (+0.07%)	3% <0%> (ø)	⬇️
... and 20 more

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[xingfudeshi]

LGTM.