Red Hat Satellite 5.8 manifest import fails looking for Oracle Java repository channel entitlements

Issue

• After upgrading to Satellite 5.8, an attempt to import the manifest fails with the following message

Certificate specifies 6 of rhel-server-7-oracle-java channel family entitlements,
     of which 4 are flex entitlements.
     There are 10 systems in the base organization
     of which 3 are virtual (flex-capable).
     You might need to unentitle some systems in the base organization.
     You need to free 4 entitlements to match the new certificate.