LU-9859 lnet: move CPT handling to LNet

LU-9859 lnet: move CPT handling to LNet

The CPT work is used for LNet and ptlrpc which is the Lustre LNet
interface. Move this work there and merge the lib-mem.c code as
well since they both work closely together. Move cpt debugfs
handling from libcfs to lnet. Now all remaining debugfs in libcfs
is for debugging.

Test-Parameters: trivial
Change-Id: I016a90520bd7c6428b45bafff8618bc864e9112b
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52923
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>