* Added a generic facility for callback to be called any time

*   Added a generic facility for callback to be called any time
    l_wait_event() happens, to take the place of daemons in the kernel
    implementation

*   Changed liblustre_services() to use the new callback.

*   Backed out the liblustre OSC rpcd changes, and converted that to use
    the new callback too.

*   Disabled mmap in alloc_pages() FTTB (it seems to screw up under linux;
    dunno exactly why right now).

*   Left some hacking utensils behind in tcpnal_send() FTTB, just to make
    it easy to see what's getting sent.

*   Added some error checking in tcpnal_send(); it will abort if something
    screws up.