QemuOpts: make most qemu_*_opts static

Switch tree to lookup-by-name using qemu_find_opts().
Also hook up virtfs options so qemu_find_opts works for them too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/blockdev.c b/blockdev.c
index 01e402b..ff7602b 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -50,7 +50,7 @@
     vsnprintf(optstr, sizeof(optstr), fmt, ap);
     va_end(ap);
 
-    opts = qemu_opts_parse(&qemu_drive_opts, optstr, 0);
+    opts = qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
     if (!opts) {
         return NULL;
     }
@@ -451,7 +451,7 @@
         break;
     case IF_VIRTIO:
         /* add virtio block device */
-        opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
+        opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
         qemu_opt_set(opts, "driver", "virtio-blk-pci");
         qemu_opt_set(opts, "drive", dinfo->id);
         if (devaddr)