Merge remote-tracking branch 'remotes/kraxel/tags/pull-ui-20160603-1' into staging

vnc: keyboard delay, colormap support
ui: misc bugfixes

# gpg: Signature made Fri 03 Jun 2016 08:02:32 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-ui-20160603-1:
  vnc: add configurable keyboard delay
  sdl2: skip init without outputs
  vnc: Add support for color map
  SDL2: add bgrx pixel format
  gtk: fix unchecked vc dereference
  ui: spice: Exit if gl=on EGL init fails
  ui: egl: Replace fprintf with error_report

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>