acl: Make the mailbox visible only when it has l/r/i right. This change only affects the ability to SUBSCRIBE to a mailbox. Previously it was allowed when user had any rights at all to mailbox.
acl: Make the mailbox visible only when it has l/r/i right.
This change only affects the ability to SUBSCRIBE to a mailbox. Previously
it was allowed when user had any rights at all to mailbox.

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot