MAR-56: Added LDIF templates to docs for relevant roles. Added warning about freshclam/clamav service restart during initial install (need to be restarted). Switched some TLS truststore vars to use concerete values. Introduced option for specifying additional Nginx config options. Added docs for some params. Assmeble Duplicity include pattern when needed. Don't set passwords for existing system users. Fix permissions for database users to be more restrictive. Fixed a couple of default param definitions (mainly tls cert/key stuff). Updated URL for downloading Prosody LDAP plugin. Updated testsite configs.