This is a slow import and the single user of it, the 'split_by_commas'
helper, does not appear to have any users outside of python-glareclient
(which is a dead project). We might want to remove the user at some
point, but for now simply defer loading of the library.
Change-Id: I91d0c6eec5333a660f995a9d1436e4b068693900
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>