+++ This bug was initially created as a clone of Bug #1667434 +++

Description of problem:
pki instance creation fails during replica install on RHEL-7.6 master from
RHEL6.10 master.

Configuring certificate server (pki-tomcatd). Estimated time: 3 minutes
  [1/28]: configuring certificate server instance
ipaserver.install.dogtaginstance: CRITICAL Failed to configure CA instance:
Command '/usr/sbin/pkispawn -s CA -f /tmp/tmp8tf06l' returned non-zero exit
status 1
ipaserver.install.dogtaginstance: CRITICAL See the installation logs and the
following files/directories for more information:
ipaserver.install.dogtaginstance: CRITICAL   /var/log/pki/pki-tomcat
  [error] RuntimeError: CA configuration failed.
Your system may be partly configured.
Run /usr/sbin/ipa-server-install --uninstall to clean up.

ipapython.admintool: ERROR    CA configuration failed.
ipapython.admintool: ERROR    The ipa-replica-install command failed. See
/var/log/ipareplica-install.log for more information


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Install IPA master on RHEL-6.10
2. Copy copy-schema-to-ca.py from 7.6 replica on Master and execute it
3. Generate replica gpg file on RHEL-6.10 master
4. Install replica on 7.6 replica with --setup-ca option


Actual results:
Replica install fails

Expected results:
Replica install should be successful

Additional info:
1. Replica install without --setup-ca option is successful
2. log files of pki instance are attached.