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>