spice: add qmp 'query-spice' and hmp 'info spice' commands.

The patch adds a 'query-spice' monitor command which returns
informations about the spice server configuration and also a list of
channel connections.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

qmp-commands.hx

@@ -1438,6 +1438,76 @@ Example:
 
 EQMP
 
+SQMP
+query-spice
+-----------
+
+Show SPICE server information.
+
+Return a json-object with server information. Connected clients are returned
+as a json-array of json-objects.
+
+The main json-object contains the following:
+
+- "enabled": true or false (json-bool)
+- "host": server's IP address (json-string)
+- "port": server's port number (json-int, optional)
+- "tls-port": server's port number (json-int, optional)
+- "auth": authentication method (json-string)
+         - Possible values: "none", "spice"
+- "channels": a json-array of all active channels clients
+
+Channels are described by a json-object, each one contain the following:
+
+- "host": client's IP address (json-string)
+- "family": address family (json-string)
+         - Possible values: "ipv4", "ipv6", "unix", "unknown"
+- "port": client's port number (json-string)
+- "connection-id": spice connection id.  All channels with the same id
+                   belong to the same spice session (json-int)
+- "channel-type": channel type.  "1" is the main control channel, filter for
+                  this one if you want track spice sessions only (json-int)
+- "channel-id": channel id.  Usually "0", might be different needed when
+                multiple channels of the same type exist, such as multiple
+                display channels in a multihead setup (json-int)
+- "tls": whevener the channel is encrypted (json-bool)
+
+Example:
+
+-> { "execute": "query-spice" }
+<- {
+      "return": {
+         "enabled": true,
+         "auth": "spice",
+         "port": 5920,
+         "tls-port": 5921,
+         "host": "0.0.0.0",
+         "channels": [
+            {
+               "port": "54924",
+               "family": "ipv4",
+               "channel-type": 1,
+               "connection-id": 1804289383,
+               "host": "127.0.0.1",
+               "channel-id": 0,
+               "tls": true
+            },
+            {
+               "port": "36710",
+               "family": "ipv4",
+               "channel-type": 4,
+               "connection-id": 1804289383,
+               "host": "127.0.0.1",
+               "channel-id": 0,
+               "tls": false
+            },
+            [ ... more channels follow ... ]
+         ]
+      }
+   }
+
+EQMP
+
 SQMP
 query-name
 ----------