Merge r210515,210516,210543 from head:

Merge r210515,210516,210543 from head:

  Prevent ukbd(4) and uhid(4) from attaching when a WiSPY DBx Spectrum
  Analyzer is attached. [1]

  Prevent uhid(4) from attaching to the Gembird Silver Shield remote power
  plug. [2]

  Prevent uhid(4) from attaching to the Liebert PowerSure Personal XT UPS.
  [3]

PR:		usb/134631 [1], usb/132785 [2], usb/129251 [3]
Submitted by:	Jesse Kempf <jkempf davisvision.com> [1]
Submitted by:	Dirk-Willem van Gulik <dirkx webweaving.org> [2]
Submitted by:	Andrew D Wiles <adw+gnats avatastic.co.uk> [3]

git-svn-id: svn://svn.freebsd.org/base/stable/8@210824 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f