Issue 49538 - replace cacertdir_rehash with openssl rehash
    
    Bug description: Enable TLS method fails on newer Fedora systems.
    It complains that cacertdir_rehash tool is not found.
    
    Fix description: The reason is that authconfig was replaced with
    authselect package. Authconfig shipped a tool called cacertdir_rehash
    which is no longer available on Fedora. We need to switch to openssl tool:
    'c_rehash <directory>' that serves the same purpose and is present on both
    RHEL7 and Fedora.
    
    Remove authconfig from 389-ds-base.spec.in because 'cacertdir_rehash'
    was the only reason why we had the dependency.
    Add openssl-perl dependency to the SPEC file.
    
    Eventially, c_rehash will go away but for now we keep it for RHEL7 compatibility.
    
    Fix a small thing in remove_ds_instance function.
    We should ignore FileNotFound errors while removing the instance.
    
    https://pagure.io/389-ds-base/issue/49538
    
    Reviewed by: mreynolds, mhonek (Thanks!)