replace magic judgement of timeout status with status enum

[leizhiyuan]

Ⅰ. Describe what this PR did

replace magic judge of timeout status with status enum, Timeout is confused here.

Ⅱ. Does this pull request fix one issue?

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

It does not need a test case, we can ensure by the code

Ⅳ. Describe how to verify it

review

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #791 into develop will decrease coverage by 0.17%.
The diff coverage is 0%.

@@              Coverage Diff              @@
##             develop     #791      +/-   ##
=============================================
- Coverage       34.4%   34.23%   -0.18%     
+ Complexity       889      888       -1     
=============================================
  Files            215      215              
  Lines           8300     8301       +1     
  Branches         996      996              
=============================================
- Hits            2856     2842      -14     
- Misses          5104     5117      +13     
- Partials         340      342       +2

Impacted Files	Coverage Δ	Complexity Δ
...alibaba/fescar/server/coordinator/DefaultCore.java	27.46% <0%> (ø)	11 <0> (ø)	⬇️
...m/alibaba/fescar/server/session/SessionHelper.java	72.41% <0%> (-2.59%)	6 <1> (+1)
...om/alibaba/fescar/core/rpc/netty/ShutdownHook.java	56.25% <0%> (-25%)	6% <0%> (-2%)
...scar/core/rpc/netty/AbstractRpcRemotingClient.java	17.7% <0%> (-2.88%)	7% <0%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 18e53c3...85d7a4b. Read the comment docs.

[slievrly]

LGTM

[xingfudeshi]

Thanks.LGTM.