ad0855f Ticket 49273 - crash when DBVERSION is corrupt.

Authored and Committed by William Brown 6 years ago
    Ticket 49273 - crash when DBVERSION is corrupt.
    
    Bug Description:  During a disk full DBVERSION was corrupted.
    As a result, we would segfault.
    
    Fix Description:  Rather than segfaulting, we should handle the
    error gracefully, with steps to resolve.
    
    Patch notes: roll up of
    9e1a761b45dfc2d28199e39c514ea66764c3f127
    d8cccbf70e2cc8b807190214a93d20b20d77db50
    5d5b9c617e8c73f3771720c1f6906bddae2612db
    
    https://pagure.io/389-ds-base/issue/49273
    
    Author: wibrown
    
    Review by: nhosoi, mreynolds (Thanks!)