Bullseye Compatibility

Mainly minimizes distance between our templates and updated comments and defaults that were changed in bullseye. Also, adapted some Debian version safeguards to work with testing.

Have not checked the prosody role for compatibility.

postfix/templates/master.cf.j2

@@ -79,7 +79,7 @@ virtual   unix  -       n       n       -       -       virtual
 lmtp      unix  -       -       y       -       -       lmtp
 anvil     unix  -       -       y       -       1       anvil
 scache    unix  -       -       y       -       1       scache
-{% if ansible_distribution_major_version|int >= 10 %}
+{% if ansible_distribution_major_version|int(default=99) >= 10 %}
 postlog   unix-dgram n  -       n       -       1       postlogd
 {% endif %}