CamelKolabImapxMetadata: initialize folder utilities
CamelKolabImapxMetadata: initialize folder utilities

* initialize and shutdown the folder (type)
  helpers in libekolabutil
* these lived inside CamelKolabImapxMetadata
  in 2.30 but have moved to libekolabutil
  now

GNOME/evolution-kolab,GNOME/evolution-kolab