If we're not running as a child process, report the interfaces on which

we're capturing.  (We do not require a -i flag; the message could be
useful if you don't specify the interface, as it lets you know which
interface was chosen, which might not be the interface you'd think it
would be.  Yes, that's arguably a libpcap bug, which I plan to look at;
it should probably try to figure out which interfaces are "active" if
possible, and prefer those.)

Use cmdarg_err() for invalid capture filters and other capture errors.

svn path=/trunk/; revision=39983

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