Pin lftools~=0.26.2

Change-Id: I4fb483ed61b7a59fc7a6685901582d79d6684cbe
diff --git a/jjb/defaults.yaml b/jjb/defaults.yaml
index ccc679b..84b884c 100644
--- a/jjb/defaults.yaml
+++ b/jjb/defaults.yaml
@@ -5,7 +5,7 @@
     name: global
 
     # lftools
-    lftools-version: <1.0.0
+    lftools-version: '~=0.26.2'
 
     # name of the SSH key to use in most cases
     jenkins-ssh-credential: 'cord-jenkins-ssh'