d4science-infrastructure/roles/redmine: support letsencrypt certificates on the dev redmine virtualhost.
library/roles/apache/tasks/apache-letsencrypt.yml: Support for letsencrypt (acme tool).
library/roles/ubuntu-deb-general/tasks/pki-basics.yml: Do not create the fake certificates if valid ones exist.
library/roles/haproxy/files: Fix to the acme scripts, the certificate path has become /etc/pki/haproxy/haproxy.pem.
library/roles/openldap-server/tasks/openldap_initializazion.yml: Fix the certificates initialization.
library/roles/ubuntu-deb-general/tasks/pki-basics.yml: Create a self signed certificate while waiting the letsencrypt one.