[3322] IfaceMgrTestConfig destructor restores default PktFilterInet6

src/lib/dhcp/tests/iface_mgr_test_config.cc

@@ -14,6 +14,7 @@
 
 #include <dhcp/pkt_filter.h>
 #include <dhcp/pkt_filter_inet.h>
+#include <dhcp/pkt_filter_inet6.h>
 #include <dhcp/tests/iface_mgr_test_config.h>
 #include <dhcp/tests/pkt_filter_test_stub.h>
 #include <dhcp/tests/pkt_filter6_test_stub.h>
@@ -42,6 +43,7 @@ IfaceMgrTestConfig::~IfaceMgrTestConfig() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().clearIfaces();
     IfaceMgr::instance().setPacketFilter(PktFilterPtr(new PktFilterInet()));
+    IfaceMgr::instance().setPacketFilter(PktFilter6Ptr(new PktFilterInet6()));
 
     IfaceMgr::instance().detectIfaces();
 }