LU-9781 llog: Improve catalog full warning

LU-9781 llog: Improve catalog full warning

When warning that a catalog file is full, provide the name
of the catalog file. If the name of catalog file isn't
defined, print its FID.

Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Change-Id: I559e43d08febfd8a1512ceb58fd3030b06372e9f
Reviewed-on: https://review.whamcloud.com/28093
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Olaf Faaland-LLNL <faaland1@llnl.gov>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>