Reduce the fallback SOMAXCONN value
Reduce the fallback SOMAXCONN value

Related issue: #2407

Motivation:

The current fallback SOMAXCONN value is 3072.  It is way too large
comparing to the default SOMAXCONN value of popular OSes.

Modifications:

Decrease the fallback SOMAXCONN value to 128 or 200 depending on the
current OS

Result:

Saner fallback value

yipen9/netty,yipen9/netty,imangry/netty-zh,DavidAlphaFox/netty,chanakaudaya/netty,yipen9/netty,yipen9/netty,DavidAlphaFox/netty,purplefox/netty-4.0.2.8-hacked,purplefox/netty-4.0.2.8-hacked,chanakaudaya/netty,imangry/netty-zh,purplefox/netty-4.0.2.8-hacked,DavidAlphaFox/netty,imangry/netty-zh,chanakaudaya/netty,DavidAlphaFox/netty,chanakaudaya/netty,chanakaudaya/netty,imangry/netty-zh,imangry/netty-zh,purplefox/netty-4.0.2.8-hacked