BUG/CLEANUP: CLI: report the proper field states in "show sess"

Commit 16f649c ("REORG: polling: rename "fd_spec" to "fd_cache"")
missed the server-facing connection during the rename, so the old
names are still in used and add a bit of confusion during the
debugging.

This should be backported to 1.6 and 1.5.
1 file changed