Use version yaml which is generated by make system

* user version yaml which is generated by
  make system instead of hardcoded version.yaml
* added version yaml rollback
* removed unused method `clean_iptables_rules`

blueprint upgrade-to-5-1
Change-Id: I27c2347a6be6550c18d00786118573a811b0a944
Merge "Use version yaml which is generated by make system"