When ipahost is run to generate an OTP and the host is already existing,
the OTP is properly generated but ipa-join will fail if the host is
already enrolled (ie when it has a keytab).
Add a step calling ipa host-disable to erase OTP and keytab before
requesting an OTP.

node and the credential cache is copied to the managed node

ipahost module is also using facts gathered from the server to find the
domain and realm.