CustodiaClient: fix IPASecStore config on ipa-4-7
    
    The backport of a Custodia client fix for f30 and related refactors
    and improvements, to the ipa-4-7 branch, had no conflicts.  But
    there is a change on newer branches that broke the backport.  The
    running of Custodia handlers in separate processes simplified the
    configuration of the ISecStore.  For ipa-4-7 we need to continue to
    explicitly configure it, so restore the old configuration behaviour.
    
    Part of: https://pagure.io/freeipa/issue/7964
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>