test: mmap_vlan_ins: wait before removing test interfaces

Removing the test interfaces while the applications are still running may
cause a test application instance to not close properly.

Signed-off-by: Matias Elo <matias.elo@nokia.com>
Reviewed-by: Bill Fischofer <bill.fischofer@linaro.org>
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>

platform/linux-generic/test/mmap_vlan_ins/mmap_vlan_ins.sh

@@ -69,6 +69,9 @@ plat_mmap_vlan_ins${EXEEXT} pktiop0p1 pcap:out=${PCAP_OUT} \
 plat_mmap_vlan_ins${EXEEXT} pcap:in=${PCAP_IN} pktiop1p0 \
 	01:02:03:04:05:06 01:08:09:0a:0b:0c
 
+# Give both processes time to close before removing interfaces
+sleep 4
+
 rm -f ${PCAP_OUT}
 cleanup_pktio_env