When a blocking system call is ongoing, the error message shown was
wrong. It was indicated that a blocking system call is on-going when
the program terminates. This is correct, but hides the error message
which describes why packetdrill is terminating.

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Sponsored by:	Netflix

The thread name is only used for debugging. On Linux this
breaks is_thread_sleeping(), since it assumes that the
process or threadname contains no space. Just don't set
this on Linux, so avoid any problems.

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This is required to support blocking system calls on FreeBSD.
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This helps in debugging.

add support for sctp_get_assoc_id_lists for [gs]etsockopt, shoult end in an error but didn't do taht for one-to-one socket