Logout and delete iscsi sessions

Change-Id: I4906f943adc226c2dba9faf5e1595f47c4466432
diff --git a/stack.sh b/stack.sh
index 596ebd6..5cc1424 100755
--- a/stack.sh
+++ b/stack.sh
@@ -899,6 +899,10 @@
         echo $instances | xargs -n1 virsh undefine || true
     fi
 
+    # Logout and delete iscsi sessions
+    sudo iscsiadm --mode node | grep $VOLUME_NAME_PREFIX | cut -d " " -f2 | xargs sudo iscsiadm --mode node --logout || true
+    sudo iscsiadm --mode node | grep $VOLUME_NAME_PREFIX | cut -d " " -f2 | sudo iscsiadm --mode node --op delete || true
+
     # Clean out the instances directory.
     sudo rm -rf $NOVA_DIR/instances/*
 fi