LU-17935 kfilnd: Cleanup debug logging

LU-17935 kfilnd: Cleanup debug logging

Log messages that refer to a struct kfilnd_transaction should print
the pointer to the struct with "TN %p".

Assign kfilnd_transaction::msg_type in the kfilnd_process_rx_event
path so that debug messages show the correct message type.

HPE-bug-id: LUs-11325
Test-Parameters: trivial
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: Iabe3bf245b64f1eb66c85259072491c723fb6119
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55398
Reviewed-by: Caleb Carlson <caleb.carlson@hpe.com>
Reviewed-by: Ron Gredvig <ron.gredvig@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>