Parameterize local CA params in util-credentials role

Allows the usage of multiple CAs (for different contexts), to be used extending the service_credentials attribute.

roles/float-base-service-credentials/meta/main.yml

@@ -4,4 +4,6 @@ dependencies:
   - role: float-util-credentials
     vars:
       credentials: "{{ float_host_service_credentials }}"
+      ca_tag: "x509"
+