Description of problem:

When migrating from 0.9.54 to 2.x, if a database has activation keys that are referencing products that have been deleted, the migration will fail.  The failure occurs in PerOrgsProductsMigrationTask due to the presence of the records in cp_activationkey_product that reference the missing products.

Version-Release number of selected component (if applicable): 2.x series

How reproducible: Always

Steps to Reproduce:
1. Starting with 0.9.54, create an activation key using a productId that does not exist.
2. Attempt to migrate to candlepin 2.0.

liquibase --driver=org.postgresql.Driver --classpath=/usr/share/java/postgresql-jdbc.jar:/var/lib/tomcat/webapps/candlepin/WEB-INF/classes/ --changeLogFile=db/changelog/changelog-update.xml --url=jdbc:postgresql:candlepin --username=candlepin  --password=<PASSWORD> migrate -Dcommunity=False

Actual results:

Liquibase update Failed: Migration failed for change set db/changelog/20150210094558-perorgproducts-phase-1.xml::20150210094558-35::crog:
     Reason: liquibase.exception.UnexpectedLiquibaseException: liquibase.exception.CustomChangeException: liquibase.exception.DatabaseException: One or more orgs failed data validation

Expected results:

Successful migration