Keystone moved from python-ldap to pyldap in the Newton release and python-ldap now requires a version of pyasn1-modules that exceeds the upper-constraint in Pike, which breaks repo builds. This patch removes python-ldap and adds pyldap in its place. Closes-Bug: 1736241 Depends-On: I1aa332ac0905bf80f80d8ff9b5c50746a85bfd59 Change-Id: I55f1fcd928c70eff3488af50d3dddb588082eb43