fix(net):optimize network log

[jwrct]

What does this PR do?
change the log level of bad message from warn to error
Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #4991 (ab07d2f) into release_v4.7.1 (1450156) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

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@@                 Coverage Diff                  @@
##             release_v4.7.1    #4991      +/-   ##
====================================================
- Coverage             54.76%   54.74%   -0.02%     
+ Complexity             8225     8224       -1     
====================================================
  Files                   840      840              
  Lines                 49638    49641       +3     
  Branches               5447     5448       +1     
====================================================
- Hits                  27183    27175       -8     
- Misses                20318    20328      +10     
- Partials               2137     2138       +1     

Impacted Files	Coverage Δ
...in/java/org/tron/core/net/P2pEventHandlerImpl.java	9.17% <0.00%> (-0.26%)	⬇️
...in/java/org/tron/core/vm/PrecompiledContracts.java	70.09% <0.00%> (-0.60%)	⬇️
...n/java/org/tron/core/db2/core/SnapshotManager.java	72.93% <0.00%> (-0.57%)	⬇️

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