Detect non-zero puppet exit status in generate_answers
Fail if the hosts fqdn is not set
setting minimal version of foreman_api to 0.1.4

We need this patch

https://github.com/mbacovsky/foreman_api/commit/434e90f7f7a962cca8a284a196fa1e03b8d03d34

otherwise some requests (POST) will fail during oauth.
Bump our submodules
Drop old debian readme, it's tested enough now
Update installer to use new form of including puppet::server