info: fix broken import

A previous patch modified the package of CellInfoProvider.
Unfortunately the patch that moved info to use UniversalSpringCell was
not updated accordingly so, when committed, it broke master.

This patch fixes that problem.

Target: master
Requires-notes: no
Requires-book: no
Patch: http://rb.dcache.org/r/5737/
Acked-by: Gerd Behrmann