Bump ldappool to 2.3.1 in rocky
Bump ldappool to 2.3.1 in rocky

It's needed for new release of keystone https://review.openstack.org/#/c/645018/

Change-Id: I3ca35926cb84a28d4493f4d980215682a2b2e399

javierpena/rdoinfo,redhat-openstack/rdoinfo