Coverity CID 182983

Coverity CID 182982

Coverity CID 182980

Coverity CID 182986

Coverity CID 44750

Needed after commit 2f50e2e1 for tcgetattr()/tcsetattr().

Bug 4845.

Disable local PTY output processing when using 'srun --unbuffered'. This
prevents the PTY subsystem from inserting extraneous \r characters into
the output stream.

Bug 4849.

We've lived without it this long, just remove it.

And rename nonbg_entries to node_entries.