Removing fix-hosts script that introduces problems

Fixes #3 update-guest-additions

Change-Id: I164f7052686b993aaacf033dd9ba38304dd88d39
WIP fix of fqdn not found (part 1)

Merge changes from https://gerrit.wikimedia.org/r/#/c/86212

and customize it to the dopa needs.
Installs maven in the developer role only

Change-Id: I7d2a65f731318ad524a2d4b754531fe1b066972c