Use canonical hostname as Service Prinicipal Name (SPN).
Use canonical hostname as Service Prinicipal Name (SPN).

* auth/auth_kerb_sspi.c
  (get_canonical_hostname): New helper to resolve canonical hostname using 
   getaddrinfo().
  (serf__kerb_init_sec_context): Use canonical hostname as SPN parameter to
   InitializeSecurityContext() function.


git-svn-id: 683495cb1553624b05a54e2ba9533425f69cf277@1460 61a7d7f5-40b7-0310-9c16-bb0ea8cb1845

coapp-packages/serf,coapp-packages/serf,coapp-packages/serf