Omit bogus version ids when migrating AssetDeployments
Omit bogus version ids when migrating AssetDeployments

Commit 54d3f256 set AssetDeployment.asset_version_id to the id of the oldest
version, not the newest, rendering the field useless. This change records
version=0 in the new deployment data to signify that a deployment did take
place but the deployed version is actually unknown

onaio/kpi,onaio/kpi,onaio/kpi,kobotoolbox/kpi,onaio/kpi,kobotoolbox/kpi,kobotoolbox/kpi,kobotoolbox/kpi,kobotoolbox/kpi