Do not use this API.
The reason is even if VConn is created using this API, it is still useless.
For example, if we do TSVConnRead, the read operation returns read_vio, if
we do TSVIOReenable (read_vio), it actually calls:
if (vc_server) vc_server->reenable(this);
this function is virtual in VConnection.h. It is defined separately for
UnixNet, NTNet and CacheVConnection.
Thus, unless VConn is either NetVConnection or CacheVConnection, it can't
be instantiated for functions like reenable.
Meanwhile, this function has never been used.
TSVConnCreate(TSEventFunc event_funcp, TSMutex mutexp)