Fix "connection" hang where we would not re-queue requests that are held after we re-connect.
Fix "connection" hang where we would not re-queue requests that are held
after we re-connect.

(These add'l requests would need to come in after we have detected the
close on the connection and already moved everything over in reset_connection.)

* outgoing.c
  (serf__open_connections): Re-attach held requests to the end of the
  request chain after we go back into the connected state.

soufianeEL/serf,stoneCC/serf,KyleSanderson/serf,stoneCC/serf,SirJson/serf,google-code-export/serf,lazysoez/serf,KyleSanderson/serf,alex1818/serf,alex1818/serf,x-clone/serf,zhupan/serf,x-clone/serf,SirJson/serf,zhengcq315/serf,google-code-export/serf,SirJson/serf,lazysoez/serf,google-code-export/serf,soufianeEL/serf,lazysoez/serf,pengdu/serf,yesoce/serf,stoneCC/serf,zhengcq315/serf,yesoce/serf,zhengcq315/serf,google-code-export/serf,pengdu/serf,yesoce/serf,lazysoez/serf,zhupan/serf,alex1818/serf,zhengcq315/serf,soufianeEL/serf,x-clone/serf,alex1818/serf,SirJson/serf,pengdu/serf,KyleSanderson/serf,yesoce/serf,stoneCC/serf,KyleSanderson/serf,zhupan/serf,x-clone/serf,pengdu/serf,soufianeEL/serf,zhupan/serf