ldap: reorganize and regroup options

Now that we have more experience with how we use the LDAP module options
we can make smarter decisions in how to organize them. We can also
explain much better what these options imply, which results in more
extensive option documentation.

mail-server/dovecot.nix

@@ -71,12 +71,12 @@ let
         tls = yes
       ''}
       tls_require_cert = hard
-      tls_ca_cert_file = ${cfg.ldap.tlsCAFile}
+      tls_ca_cert_file = ${cfg.ldap.caFile}
       dn = ${cfg.ldap.bind.dn}
       sasl_bind = no
       auth_bind = yes
-      base = ${cfg.ldap.searchBase}
-      scope = ${mkLdapSearchScope cfg.ldap.searchScope}
+      base = ${cfg.ldap.base}
+      scope = ${mkLdapSearchScope cfg.ldap.scope}
       user_attrs = \
         ${ldapUuidAttribute}=${ldapUuidAttribute}, \
         =home=/var/vmail/ldap/%{ldap:${ldapUuidAttribute}}, \