older dovecot requires namespace separator

install/tpl/debian6_dovecot2.conf.master

@@ -109,6 +109,7 @@ plugin {
 imap_capability=+SEPCIAL-USE XLIST
 namespace inbox {
   inbox = yes
+  separator = .
   mailbox Drafts {
     special_use = \Drafts
   }

install/tpl/fedora_dovecot2.conf.master

@@ -105,6 +105,7 @@ plugin {
 imap_capability=+SEPCIAL-USE XLIST
 namespace inbox {
   inbox = yes
+  separator = .
   mailbox Drafts {
     special_use = \Drafts
   }

install/tpl/opensuse_dovecot2.conf.master

@@ -104,6 +104,7 @@ plugin {
 imap_capability=+SEPCIAL-USE XLIST
 namespace inbox {
   inbox = yes
+  separator = .
   mailbox Drafts {
     special_use = \Drafts
   }