[Dubbo-1431] Fix endless loop bug while NetUtils.getLocalHost() throw exception

[leiwei2094]

What is the purpose of the change

Fix a bug: when NetUtils.getLocalHost() throw an exception, an endless loop will occur:
NetUtils.getLocalHost() -> FailsafeLogger.appendContextMessage() -> NetUtils.getLocalHost()

Brief changelog

When NetUtils.getLocalHost() throw exception, do not append ip information to log message, to avoid endless loop.

Verifying this change

Unit test passed.

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[codecov-io]

Codecov Report

Merging #1878 into master will decrease coverage by 0.04%.
The diff coverage is 7.14%.

@@             Coverage Diff              @@
##             master    #1878      +/-   ##
============================================
- Coverage     42.56%   42.51%   -0.05%     
+ Complexity     4710     4708       -2     
============================================
  Files           646      646              
  Lines         30657    30665       +8     
  Branches       5378     5378              
============================================
- Hits          13049    13038      -11     
- Misses        15595    15612      +17     
- Partials       2013     2015       +2

Impacted Files	Coverage Δ	Complexity Δ
...ba/dubbo/common/logger/support/FailsafeLogger.java	70% <0%> (-6.83%)	20 <0> (ø)
.../java/com/alibaba/dubbo/common/utils/NetUtils.java	15.78% <16.66%> (ø)	13 <1> (ø)	⬇️
...va/com/alibaba/dubbo/config/DubboShutdownHook.java	43.47% <0%> (-30.44%)	5% <0%> (-1%)
...om/alibaba/dubbo/rpc/filter/ActiveLimitFilter.java	83.33% <0%> (-5.56%)	6% <0%> (-1%)
.../com/alibaba/dubbo/monitor/dubbo/DubboMonitor.java	87.85% <0%> (-1.87%)	15% <0%> (ø)

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[beiwei30]

I notice there are three different changes mixed together. For #1431 I've checked in a different solution. Pls. checkin protobuf support only, and consider to add demo code in https://github.com/dubbo/dubbo-samples

[beiwei30]

pls. check in protobuf support only. The solution for issue#1431 is already in.