Bug 729369 - upgrade DB to upgrade from entrydn to entryrdn format is not working.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=729369
    Resolves: bug 729369
    Bug Description: upgrade DB to upgrade from entrydn to entryrdn format is not working.
    Reviewed by: nhosoi (Thanks!)
    Branch: RHEL-6_1-Z
    Fix Description: Looks like the test to see if upgrade should proceed is
    only looking at the old IDL to new IDL case, not the upgrade from earlier
    versions of bdb, nor the upgrade DN to RDN case.
    Also, there was no way to pass the -f (force) flag to dn2rdn to force
    the conversion.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit 062c4d9df34998ac15817406e73a6b0fe6928120)