Don't execute deployment roles if packages are not installed #1363
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When running the deployment roles, if packages are not installed, an
error of a missing module is shown, which is confusing to users.
By ensuring that either installation or uninstallation only work if a
minimal set of tools is available allows to provide a meaningful message
and let users act on the environment.
For installation, if ipa-server/client-install is not available, the
installation is aborted with a meaningful error. For uninstallation, we
assume that IPA is not installed and gently finish the process with no
errors.
ipareplicauninstall is not modified as it usesipaserverrole.Fix #1362