Make sure samba{,4}-winbind-krb5-locator package is not used with trusts
Since use of winbind on FreeIPA server that is configured with trusts is
conflicting with krb5 locator based on winbind, use alternatives mechanism
to turn off the locator plugin by symlinking it to /dev/null.
https://fedorahosted.org/freeipa/ticket/3102