Revert "Remove irrelevant configs"

This reverts commit 1ad37309e4f17d73c2f22c3ff4bffe2523abe17c.

Conflicts:
* tests/scripts/test-ref-configs.pl:
    * config-ccm-psk-tls1_2.h: there has been an addition of
      "config-symmetric-only.h" at the place where the configurations
      that are added back were removed. Keep this configuration.
diff --git a/tests/scripts/test-ref-configs.pl b/tests/scripts/test-ref-configs.pl
index b29d0dd..3dea004 100755
--- a/tests/scripts/test-ref-configs.pl
+++ b/tests/scripts/test-ref-configs.pl
@@ -17,10 +17,18 @@
 use strict;
 
 my %configs = (
-    'config-symmetric-only.h' => {
+    'config-default.h' => {
+    },
+    'config-mini-tls1_1.h' => {
     },
     'config-suite-b.h' => {
     },
+    'config-symmetric-only.h' => {
+    },
+    'config-ccm-psk-tls1_2.h' => {
+    },
+    'config-thread.h' => {
+    },
 );
 
 # If no config-name is provided, use all known configs.