xfs: rename xfs_cil_ctx to xlog_chkpt

We'll be extending the cil context to a broader life time and and
meaning. So, it's pertinent to rename it to xlog_chkpt.

On the following patches, it will become the new container for items in
the AIL, instead of the current item linked list

Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>

4 files changed