Revert "network: manage /etc/hosts using ansible module"

This reverts commit 08b1f18b3c3004277d7d0790cfcf8c44bc2dff1f.

Module `host` was removed [1] from ansible source code.

1: https://github.com/ansible/ansible/commit/b29669dccdd61afac11557f4baa6c1e397e70667
docs: ansible released version required
docs: add ansible source installation instructions
Merge pull request #82 from migonzalvar/remove-host-module

[TEST] Remove host module