fuel_upgrade: add ApplyVersioncmpFix hook

We found a critical bug in puppet's versioncmp function which doesn't
behave like RPM does, so we've implemented a new function as a fix.

Now we have to deliver this fix for both 5.0 and 5.0.1, because without
this fix the rollback to 5.0 and 5.0.1 will fails.

Change-Id: I6c416597cf6efc1b49c7ce755244ea81acead48b
Blueprint: upgrade-to-5-1
Merge "fuel_upgrade: add ApplyVersioncmpFix hook"