Merge remote-tracking branch 'spice/tags/pull-spice-1' into staging

Merge remote-tracking branch 'spice/tags/pull-spice-1' into staging

Collection of little cleanups anf bugfixes.
nbd patches in preparation of spice-nbd.

# gpg: Signature made Mon 16 Dec 2013 01:27:45 AM PST using RSA key ID D3E87138
# gpg: Can't check signature: public key not found

# By Marc-André Lureau (12) and Gerd Hoffmann (4)
# Via Gerd Hoffmann
* spice/tags/pull-spice-1:
  spice: stop server for qxl hard reset
  spice: move spice_server_vm_{start,stop} calls into qemu_spice_display_*()
  spice: move qemu_spice_display_*() from spice-graphics to spice-core
  nbd: avoid uninitialized warnings
  nbd: finish any pending coroutine
  nbd: make nbd_client_session_close() idempotent
  nbd: pass export name as init argument
  nbd: don't change socket block during negotiate
  Split nbd block client code
  spice-char: implement chardev port event
  char: add qemu_chr_fe_event()
  include: add missing config-host.h include
  qmp_change_blockdev() remove unused has_format
  spice-char: remove unused field
  vscclient: do not add a socket watch if there is not data to send
  spice: flip streaming video mode to off by default