Add guc to enable send SIGSTOP to peers when backend exits abnormally

[蔡梦娟(玊于)]

Hi all

I want to share a patch with you, in which I add a guc parameter 
'enable_send_stop' to enable set the value of SendStop in postmaster.c more 
conveniently.  SendStop enable postmaster to send SIGSTOP rather than SIGQUIT 
to its children when some backend dumps core, and this variable is originally 
set with -T parameter when start postgres, which is inconvenient to control in 
some scenarios.

Thanks & Best Regards

0001-Add-guc-to-set-SendStop.patch
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