Fix ipa-replica-prepare server-cert creation

Fixes an issue introduced in 0a54fac0, we need to specify the current
master's hostname so that we know to which CA we need to connect to
create the other's server Server-Cert.

https://pagure.io/freeipa/issue/6755

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipaserver/install/ipa_replica_prepare.py

@@ -603,7 +603,8 @@ class ReplicaPrepare(admintool.AdminTool):
 
         try:
             db = certs.CertDB(
-                api.env.realm, nssdir=self.dir, subject_base=subject_base)
+                api.env.realm, nssdir=self.dir, subject_base=subject_base,
+                host_name=api.env.host)
             db.create_passwd_file()
             db.create_from_cacert()
             db.create_server_cert(nickname, hostname)