- new RPC infrastructure:

- new RPC infrastructure:
 - struct service with callback functions, buffers and Portals support
 - services are Portal aware, but the old null transport may still work.
 - lustre peer moved to Portals, as was all connection management
 -
- fixed ptl entry constants for incoming REQUESTS, REPLIES for MDS, OST etc.
- all rpc's now have a peer destination (which can be NULL)
- replies are now pre-allocated
- the XID's are used to number transactions _and_ as match entries
- packet movement differentiates Portals and non-portals case.
- reception of packets uses the new Portals callbacks
- module initialization finds peer's by UUID.  For now "mds" is a UUID.
- callbacks are used for (1) incoming requests (2) freeing outgoing packets
(3) incomding reply.  Code reuse was possible.
- adapted all the test scripts (mdc and llmount)