MFC r298881, 298882, 298883, 298885:Minor spelling fixes in:tools, share, bluetooth, pmcstat, etcMany of these have user-visible strings.
Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Bring over the visibility control tool for Monthadar's wtap project.This allows basic control over which wtap nodes can see which otherwtap nodes.