[ISSUE #8061] Fix npe in netty remoting client

[fujian-zfj]

Which Issue(s) This PR Fixes

Fixes #8061

Brief Description

I found a npe bug in method getAndCreateChannel.

It may caused by 'getAndCreateChannelAsync(addr).awaitUninterruptibly()' in method getAndCreateChannel.

Since channelFuture has got from getAndCreateChannelAsync and is judged not null, why not use channelFuture instead of getAndCreateChannelAsync again?

How Did You Test This Change?

[cserwen]

Rebase develop branch to fix some errors of ci. @fujian-zfj

[RongtongJin]

Hi @fujian-zfj you need to merge the develop branch to include the latest unit test fixes.

[fujian-zfj]

Hi @fujian-zfj you need to merge the develop branch to include the latest unit test fixes.
OK

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.88%. Comparing base (159a603) to head (2e0bae0).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8064      +/-   ##
=============================================
- Coverage      42.91%   42.88%   -0.04%     
+ Complexity     10382    10374       -8     
=============================================
  Files           1270     1270              
  Lines          88694    88694              
  Branches       11401    11401              
=============================================
- Hits           38066    38035      -31     
- Misses         45935    45957      +22     
- Partials        4693     4702       +9     

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