Revert "Merge pull request #405 from sonatype/nexus-2.8.x-NEXUS-5987-routing-user-managed-reposes"

This reverts commit e7adfee37c3adaab01d8d3ec3690ce6546076a07, reversing
changes made to db7aa2124de040b2a3703a1e9b1d469b11f2525e.