VNC: Convert do_info_vnc() to QObject

Return a QDict with server information. Connected clients are returned
as a QList of QDicts.

The new functions (vnc_qdict_remote_addr(), vnc_qdict_local_addr() and
put_addr_qdict()) are used to insert 'host' and 'service' information
in the returned QDict.

This patch is big, but I don't see how to split it.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/monitor.c b/monitor.c
index 897280a..d97d529 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2529,7 +2529,8 @@
         .args_type  = "",
         .params     = "",
         .help       = "show the vnc server status",
-        .mhandler.info = do_info_vnc,
+        .user_print = do_info_vnc_print,
+        .mhandler.info_new = do_info_vnc,
     },
     {
         .name       = "name",