set rollback to not remove_data by default

installations/dc1/installation-rollback.yml

diff --git a/installations/dc1/installation-rollback.yml b/installations/dc1/installation-rollback.yml
index bc53acb..e10255a 100644
--- a/installations/dc1/installation-rollback.yml
+++ b/installations/dc1/installation-rollback.yml
@@ -1,6 +1,6 @@
 ---
 - hosts: '{{ hosts }}'
   vars:
-    remove_data: true
+    remove_data: false
   roles:
   - opdk-setup-bootstrap-rollback