testing: Enable VTI module in kernel config

testing/testing.conf

@@ -24,11 +24,11 @@ fi
 : ${TESTDIR=/srv/strongswan-testing}
 
 # Kernel configuration
-: ${KERNELVERSION=4.10.17}
+: ${KERNELVERSION=4.13.16}
 : ${KERNEL=linux-$KERNELVERSION}
 : ${KERNELTARBALL=$KERNEL.tar.xz}
-: ${KERNELCONFIG=$DIR/../config/kernel/config-4.10}
-: ${KERNELPATCH=ha-4.4-abicompat.patch.bz2}
+: ${KERNELCONFIG=$DIR/../config/kernel/config-4.13}
+: ${KERNELPATCH=ha-4.13-abicompat.patch.bz2}
 
 # strongSwan version used in tests
 : ${SWANVERSION=5.6.2dr3}