[MINOR] Fix flaky test testGetHostIp

[izchen]

What changes were proposed in this pull request?

Do not use InetAddress.getLocalHost().getHostAddress() in test because it is indeterminate. The return value may be different on a multi-NIC machine or on different system.

Why are the changes needed?

In addition to 127.0.0.1, the loopback address 127.0.1.1 can also be returned, which happens on Debian.This will make UT fail.

org.opentest4j.AssertionFailedError: 
Expected :127.0.1.1
Actual   :10.0.191.230

at org.apache.uniffle.common.util.RssUtilsTest.testGetHostIp(RssUtilsTest.java:64)

Does this PR introduce any user-facing change?

No.

How was this patch tested?

UT.

[codecov-commenter]

Codecov Report

Merging #141 (2c81eec) into master (79804c5) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #141      +/-   ##
============================================
+ Coverage     57.18%   57.21%   +0.03%     
  Complexity     1201     1201              
============================================
  Files           150      150              
  Lines          8179     8185       +6     
  Branches        773      773              
============================================
+ Hits           4677     4683       +6     
  Misses         3256     3256              
  Partials        246      246              

Impacted Files	Coverage Δ
.../java/org/apache/uniffle/common/util/RssUtils.java	66.19% <ø> (ø)
.../java/org/apache/spark/shuffle/RssSparkConfig.java	96.66% <0.00%> (+0.17%)	⬆️

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[jerqi]

Thanks @izchen , wait for GA.

[izchen]

Thanks for your review, @jerqi !