flag from the listening socket [fd] (at the very least, it is getting
set to O_NONBLOCK somewhere).  The _read_io_header() function still
assumes that the socket is in blocking mode, so this fix explicitly sets
the socket to blocking mode.

credential.

switch/federation can resolve Federation API symbols.

switch/federation can resolve Federation API symbols.

switch/federation can resolve Federation API symbols.

 for now).

no-ops on non-Federation switch systems.

    of communication protocol over IBM Federation switch.
 -- Add new slurm.conf parameter ProctrackType (process tracking) and
    associated plugin in the slurmd module.