iu-capabilities: use listMailboxes from IMAP::Utils
iu-capabilities: use listMailboxes from IMAP::Utils

git-svn-id: 86acfdfd144c8158e0d7a18da3008098cf316b21@42 fecb0d30-6951-9c89-840e-75dbee0e63d9

nichdu/imaputils