Adds a migration step to pull in old reputation success / total counts into modern alpha / beta scores
If audit success count is less than 50, audit alpha will be set to 50
If uptime success count is less than 100, uptime alpha will be set to 100
This helps us deal with cases where nodes have not been audited or checked for uptime yet, in which case alpha/beta values of 0/0 would cause a node to be considered disqualified.
A node with audit alpha/beta of 50/0 will be disqualified on the 19th check
A node with uptime alpha/beta of 100/0 will be disqualified on the 44th check
This does not affect brand new nodes (nodes that were not in the database before this change). The alpha/beta values for those nodes will be set to 1/0 as before
