optimize: use the ip of the peerId as the host of the raft node

[PeppaO]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

raft创建node时，采用peerId作为host，而不是xid的ip，因为当不设置SEATA_IP时，xid的ip为podIp，podIp会变动，这会导致在集群扩缩容时，节点只增不减，不是唯一的，而peerId的ip是一个svc域名

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

[funky-eyes]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.08%. Comparing base (5c353cf) to head (a3dd5b9).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...he/seata/server/cluster/raft/RaftStateMachine.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7182      +/-   ##
============================================
+ Coverage     52.07%   52.08%   +0.01%     
- Complexity     6854     6856       +2     
============================================
  Files          1169     1169              
  Lines         41461    41461              
  Branches       4850     4850              
============================================
+ Hits          21590    21595       +5     
+ Misses        17814    17811       -3     
+ Partials       2057     2055       -2     

Files with missing lines	Coverage Δ
...he/seata/server/cluster/raft/RaftStateMachine.java	44.15% <50.00%> (ø)

... and 2 files with indirect coverage changes