vz: support disabled items in vz boot order

At the time the check was written virtuozzo did not use disabled items in boot
order configuration. Boot items were always enabled. Now they can be disabled
as well. Supporting such items is easy - they just should be ignored.

src/vz/vz_sdk.c

@@ -1790,11 +1790,8 @@ prlsdkConvertBootOrderVm(PRL_HANDLE sdkdom, virDomainDefPtr def)
         pret = PrlBootDev_IsInUse(bootDev, &inUse);
         prlsdkCheckRetGoto(pret, cleanup);
 
-        if (!inUse) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                           _("Boot ordering with disabled items is not supported"));
-            goto cleanup;
-        }
+        if (!inUse)
+            continue;
 
         pret = PrlBootDev_GetSequenceIndex(bootDev, &bootIndex);
         prlsdkCheckRetGoto(pret, cleanup);