Create a per-connection config object and share it will all buckets in the incoming and outgoing bucket chains.
Create a per-connection config object and share it will all buckets in the
incoming and outgoing bucket chains.

* outgoing.c
  (do_conn_setup): Pass the connection config to the buckets as much upstream
      in the chains as possible, from where they will be passed to all down-
      stream buckets, ensuring that all buckets have access to the shared
      config.
  (read_from_connection): Each time a new response bucket is created by the
      application, share the per connection config with it.
  (serf_connection_create2): Create the per connection config object with some
      (initial) values.

TommyU/serf,blueszhangsh/serf,muthusuba/serf,Manouchehri/serf,Manouchehri/serf,idomon/serf,liuzongquan/serf,wzugang/serf,sworda/serf,idomon/serf,Manouchehri/serf,wzugang/serf,krime/serf,TommyU/serf,krime/serf,blueszhangsh/serf,muthusuba/serf,justinweb/serf,liuzongquan/serf,idomon/serf,muthusuba/serf,justinweb/serf,liuzongquan/serf,justinweb/serf,justinweb/serf,sworda/serf,TommyU/serf,Manouchehri/serf,wzugang/serf,TommyU/serf,idomon/serf,krime/serf,blueszhangsh/serf,wzugang/serf,krime/serf,sworda/serf,muthusuba/serf,sworda/serf,liuzongquan/serf,blueszhangsh/serf