Move configuration context processing into subfunctions

The functions allow simple operations on configuration context
objects. This makes it easier to understand what the code does and allows
reuse of the configuration processing code.

server/core/server.c

@@ -1354,14 +1354,3 @@ bool server_destroy(SERVER *server)
 
     return rval;
 }
-
-bool server_is_ssl_parameter(const char *key)
-{
-    // TODO: Implement this
-    return false;
-}
-
-void server_update_ssl(SERVER *server, const char *key, const char *value)
-{
-    // TODO: Implement this
-}