tests: fix default node variant in tests

Pass a correct form of node variant config in tests

Type: fix
Signed-off-by: d-valter@yandex-team.ru
Change-Id: I8cdc240b18a1664e57a5814d6cd644891c99f515
Fixes: 8800f732f868bf54da8adba05e38bd2477895ca5
diff --git a/test/asf/asfframework.py b/test/asf/asfframework.py
index ab7141e..5bcbfcc 100644
--- a/test/asf/asfframework.py
+++ b/test/asf/asfframework.py
@@ -375,7 +375,7 @@
             coredump_size = "coredump-size unlimited"
         default_variant = config.variant
         if default_variant is not None:
-            default_variant = "defaults { %s 100 }" % default_variant
+            default_variant = "default { variant %s 100 }" % default_variant
         else:
             default_variant = ""