Description of problem:

I'm seeing ipa-adtrust-install fail in RHEL7 unless I set KRB5CCNAME variable
like in bug #904720 for Fedora 18.

[root@rhel7-1 ~]# klist
Ticket cache: DIR::/run/user/0/krb5cc/tktezfUZl
Default principal: admin@TESTRELM.COM

Valid starting       Expires              Service principal
07/03/2013 14:35:30  07/04/2013 14:35:30  krbtgt/TESTRELM.COM@TESTRELM.COM
[root@rhel7-1 ~]# echo $KRB5CCNAME

[root@rhel7-1 ~]# ipa-adtrust-install --netbios-name=NBEXAMPLE -a PASSWORD -U

The log file for this installation can be found in
/var/log/ipaserver-install.log
==============================================================================
This program will setup components needed to establish trust to AD domains for
the IPA Server.

This includes:
  * Configure Samba
  * Add trust related objects to IPA LDAP server

To accept the default shown in brackets, press the Enter key.

Outdated Kerberos credentials. Use kdestroy and kinit to update your ticket

Version-Release number of selected component (if applicable):
ipa-server-3.2.1-1.el7.x86_64


How reproducible:
always


Steps to Reproduce:
1.  Setup IPA server
2.  ipa-adtrust-install --netbios-name=NBEXAMPLE -a PASSWORD -U
3.

Actual results:
Fails with outdated credentials error listed above.

Expected results:
Works without error.

Additional info:
Setting KRB5CCNAME as described in similar bug works around the isssue.

export KRB5CCNAME=/tmp/krb5cc_$(id -u)