[#1409] fix(client): Netty Epoll is unavailable for the RSS Client.

[rickyma]

What changes were proposed in this pull request?

Fix a bug that was introduced from #343.
The Netty native libraries have never been successfully shaded. PR #924 is not working at all.

Why are the changes needed?

For #1409

Does this PR introduce any user-facing change?

No.

How was this patch tested?

By running the RSS Netty client with Epoll mode successfully.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (995ed46) 53.24% compared to head (3192573) 54.16%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1410      +/-   ##
============================================
+ Coverage     53.24%   54.16%   +0.92%     
- Complexity     2719     2720       +1     
============================================
  Files           419      399      -20     
  Lines         23966    21605    -2361     
  Branches       2042     2042              
============================================
- Hits          12760    11702    -1058     
+ Misses        10418     9187    -1231     
+ Partials        788      716      -72     

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[rickyma]

PTAL @jerqi

[roryqi]

What will it happen if we don't have this pr?

[rickyma]

As described in #1409, java.lang.UnsatisfiedLinkError will be thrown.

Also, a more detailed description will be:

before this PR:

after this PR:

@jerqi

[roryqi]

LGTM, thanks @rickyma , merged to master.