Merge branch 'devel-2.2'

* devel-2.2:
  RAPI client: Support modifying instances
  RAPI: Allow modifying instance
  Small fixes for instance creation via RAPI documentation
  gnt-debug: Extend job queue tests
  jqueue: Mark opcodes following failed ones as failed, too
  jqueue: Work around race condition between job processing and archival
  jqueue: More checks for cancelling queued job
  errors: Function to check whether value is encoded error
  jqueue: Add more debug output
  gnt-backup: Pass error code to OpPrereqError
  Fix --master-netdev arg name in gnt-cluster(8)
  Restore 'tablet mouse on vnc' behavior
  Document the usb_mouse hv parameter
  Revert "Add -usbdevice tablet to KVM when using vnc"

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>