Accept socket judge fd overflow

[kukey]

when we use sentinel manage a large cluster, the fd may overflow; then the clients that cfd greater than the aeEvent size, lead to these clients leak.

Because in createCleint(), we don`t check connSetReadHandler() return values.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 71.50%. Comparing base (d6507f3) to head (c592be9).

Files with missing lines	Patch %	Lines
src/socket.c	25.00%	3 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2255      +/-   ##
============================================
+ Coverage     71.47%   71.50%   +0.03%     
============================================
  Files           123      123              
  Lines         66903    66907       +4     
============================================
+ Hits          47816    47841      +25     
+ Misses        19087    19066      -21     

Files with missing lines	Coverage Δ
src/socket.c	91.16% <25.00%> (-0.37%)	:arrow_down:

... and 10 files with indirect coverage changes

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[kukey]

like this sentinel client list, our sentinel set maxclients 10000, but there are some clients fd more than 10000.

[arthurkiller]

good catch!