Add test case for custom interface parameters

	- update test pillars
	- update schemas

Related Prod: PROD-30096

Change-Id: I5796bee1226d725a857f70c2ed874999d58b3994
diff --git a/tests/pillar/server.sls b/tests/pillar/server.sls
index b623e0c..08713b4 100644
--- a/tests/pillar/server.sls
+++ b/tests/pillar/server.sls
@@ -17,3 +17,7 @@
     strata:
     - ntp.cesnet.cz
     - pool.ntp.org
+    interface:
+      test:
+        action: action
+        value: value
\ No newline at end of file