Adds new API:
ipa host-allow-retrieve-keytab HOSTNAME --users=STR --groups STR
ipa host-disallow-retrieve-keytab HOSTNAME --users=STR --groups STR
ipa host-allow-create-keytab HOSTNAME --users=STR --groups STR
ipa host-disallow-create-keytab HOSTNAME --users=STR --groups STR
ipa service-allow-retrieve-keytab PRINCIPAL --users=STR --groups STR
ipa service-disallow-retrieve-keytab PRINCIPAL --users=STR --groups STR
ipa service-allow-create-keytab PRINCIPAL --users=STR --groups STR
ipa service-disallow-create-keytab PRINCIPAL --users=STR --groups STR
these methods add or remove user or group DNs in `ipaallowedtoperform` attr with
`read_keys` and `write_keys` subtypes.
service|host-mod|show outputs these attrs only with --all option as:
Users allowed to retrieve keytab: user1
Groups allowed to retrieve keytab: group1
Users allowed to create keytab: user1
Groups allowed to create keytab: group1
Adding of object class is implemented as a reusable method since this code is
used on many places and most likely will be also used in new features. Older
code may be refactored later.
https://fedorahosted.org/freeipa/ticket/4419
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Petr Vobornik
59ee6314af