Title: #829: client.py: Replace hardcoded 'admin' with options.principal
ticket 5060 was related to ipa-replica-install. You can see that ipa-client-automount is
still using hardcoded "admin" value in line
(https://pagure.io/freeipa/blob/master/f/client/ipa-client-automount#_88), but it is
just used to ensure that SSSD is up. As ipa-client-automount does not prompt for any
kerberos principal, I guess we can leave this part as is.
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