qapi: Create block-export module

Move all block export related types and commands from block-core to the
new QAPI module block-export.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200924152717.287415-3-kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qapi/meson.build b/qapi/meson.build
index 7c4a89a..ea359a0 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -17,8 +17,9 @@
   'acpi',
   'audio',
   'authz',
-  'block-core',
   'block',
+  'block-core',
+  'block-export',
   'char',
   'common',
   'control',
@@ -49,6 +50,7 @@
 
 qapi_storage_daemon_modules = [
   'block-core',
+  'block-export',
   'char',
   'common',
   'control',