Merge remote-tracking branch 'quintela/tags/migration/20170518' into staging

Merge remote-tracking branch 'quintela/tags/migration/20170518' into staging

migration/next for 20170518

# gpg: Signature made Thu 18 May 2017 06:23:26 PM BST
# gpg:                using RSA key 0xF487EF185872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>"
# gpg:                 aka "Juan Quintela <quintela@trasno.org>"
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* quintela/tags/migration/20170518:
  migration: Make savevm.c target independent
  exec: Create include for target_page_size()
  migration: migration.h was not needed
  migration: Remove vmstate.h from migration.h
  migration: Remove qemu-file.h from vmstate.h
  migration: Split vmstate-types.c from vmstate.c
  migration: Move qjson.h to migration/
  migration: Remove migration.h from colo.h
  migration: Export qemu-file-channel.c functions in its own file
  migration: Split migration/channel.c for channel operations
  migration: Create migration/xbzrle.h
  block migration: Allow compile time disable
  migration: Remove old MigrationParams
  migration: Remove use of old MigrationParams
  migration: Create block capability
  hmp: Use visitor api for hmp_migrate_set_parameter()
  postcopy: Require RAMBlocks that are whole pages
  migration: Fix non-multiple of page size migration

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>