Follow up to r2055: Fix segfault in the test suite.
Follow up to r2055: Fix segfault in the test suite.

* test/server/test_server.c
  (proxy_replay): Create servctx->servstream when needed.

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