CRM-13981, migrate honoree information to uf_join.module_data during upgrade

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* CRM-13981: Migrate "In Honor of" to Soft Credits
  https://issues.civicrm.org/jira/browse/CRM-13981
Merge pull request #3262 from monishdeb/CRM-13981

CRM-13981, migrate honoree information to uf_join.module_data during upgrade