Add missing sriov_agent.ini + update test structure

Change-Id: If431aa5dc8c65abf6e4da947421f3c6cfb8f820d
Related-PROD: PROD-25611
diff --git a/tests/pillar/gateway_legacy_l2gw.sls b/tests/pillar/gateway_legacy_l2gw.sls
index d3cd4a8..df45399 100644
--- a/tests/pillar/gateway_legacy_l2gw.sls
+++ b/tests/pillar/gateway_legacy_l2gw.sls
@@ -27,11 +27,4 @@
       enabled: true
       ovsdb_hosts:
         ovsdbx: 10.164.5.33:6632
-linux:
-  system:
-    enabled: true
-    repo:
-      mirantis_openstack_pike:
-        source: "deb http://mirror.fuel-infra.org/mcp-repos/pike/xenial pike main"
-        architectures: amd64
-        key_url: "http://mirror.fuel-infra.org/mcp-repos/pike/xenial/archive-mcppike.key"
+