Description of problem:
In case the integrated DNS service should be used for IdM, either by using the
non-interactive '--setup-dns' option or by answering 'yes' to the interactive
'Do you want to configure integrated DNS (BIND)?' question, the check whether
the 'ipa-server-dns' package is installed, only comes after a lot of other
information have been evaluated ([server|dns|realm] name, DM and admin
password). This is annoying in case of an interactive installation procedure
where all those information have to be entered manually.

The ask here is to perform the check, whether the 'ipa-server-dns' package is
installed or not, earlier in the installation routine.

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