iscsiadm: fix parallel rescan handling of exit codes

The parallel rescan patches work, in so much as the rescans happen, but
if a target is specified the non-matching cases cause warning to be
printed and a non-zero exit code.

To reproduce: have more than one session to different targets, issue a
node mode rescan command to one of them (-m node -T <iqn.target> -R).

The problem is that while exit() takes an int, only the low byte is part
of the exit code and it's combined with other exit status information.
iscsiadm tries to use exit(-1) to indicate a non-match (not a fatal
error). The value retrieved with wait() after an exit(-1) is actually
65280.

Fix this by making use of the wait.h macros for checking the exit code.

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