Fix acmeserver dns-01 configuration

roles/float-infra-acme/templates/config.yml.j2

@@ -10,8 +10,8 @@ http:
   enabled: true
 dns:
   enabled: true
-  tsig_key_name: "acme"
-  tsig_key_algo: "{{ acme_tsig_key.algo }}"
+  tsig_key_name: "acme."
+  tsig_key_algo: "{{ acme_tsig_key.algo | lower }}"
   tsig_key_secret: "{{ acme_tsig_key.private }}"
   nameservers:
 {% for h in services['dns'].hosts | sort %}