external scheduler control of RoolOnly partition (Chris Holmes, HP).

switch_p_job_postfini().

While not ideal, it makes for one less thing to worry about updating
when a new release and thus should be better in the long run.

happening correctly.

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.