The credentials of the admin user will be used to obtain Kerberos ticket before
configuring cross-realm trusts support and afterwards, to ensure that the
ticket contains MS-PAC information required to actually add a trust with Active
Directory domain via 'ipa trust-add --type=ad' command.
https://fedorahosted.org/freeipa/ticket/2852
When setting up AD trusts support, ipa-adtrust-install utility
needs to be run as:
- root, for performing Samba configuration and using LDAPI/autobind
- kinit-ed IPA admin user, to ensure proper ACIs are granted to
fetch keytab
As result, we can get rid of Directory Manager credentials in ipa-adtrust-install
https://fedorahosted.org/freeipa/ticket/2815
