ipa-cert-fix: Don't hardcode the NSS certificate nickname
The nickname of the 389-ds certificate was hardcoded as
Server-Cert which failed if the user had installed a
third-party certificate using ipa-server-certinstall.
Instead pull the nickname from the DS configuration and
retrieve it based on that.
https://pagure.io/freeipa/issue/8600
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>