Port ipapython.dnssec.odsmgr to xml.etree
The module ipapython.dnssec.odsmgr is the only module in ipalib,
ipaclient, ipapython and ipaplatform that uses lxml.etree.
https://fedorahosted.org/freeipa/ticket/6469
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>