Make backup version blocker test more robust
Make backup version blocker test more robust

Assuming that VERSION != VERSION.reverse is not robust. This will fail
at e.g. version 6.6.6.

8thcolor/eurucamp2014-htdsadr,8thcolor/rubyconfau2015-sadr,8thcolor/eurucamp2014-htdsadr,8thcolor/eurucamp2014-htdsadr,8thcolor/rubyconfau2015-sadr,8thcolor/rubyconfau2015-sadr