qemu-storage-daemon: Add --monitor option

This adds and parses the --monitor option, so that a QMP monitor can be
used in the storage daemon. The monitor offers commands defined in the
QAPI schema at storage-daemon/qapi/qapi-schema.json.

The --monitor options currently allows to create multiple monitors with
the same ID. This part of the interface is considered unstable. We will
reject such configurations as soon as we have a design for the monitor
subsystem to perform these checks. (In the system emulator, we depend on
QemuOpts rejecting duplicate IDs.)

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200224143008.13362-21-kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qapi/transaction.json b/qapi/transaction.json
index 04301f1..b6c1115 100644
--- a/qapi/transaction.json
+++ b/qapi/transaction.json
@@ -5,7 +5,7 @@
 # = Transactions
 ##
 
-{ 'include': 'block.json' }
+{ 'include': 'block-core.json' }
 
 ##
 # @Abort: