LU-16741 ptlrpc: ptlrpc: rename ptlrpc_req_finished

LU-16741 ptlrpc: ptlrpc: rename ptlrpc_req_finished

First series of patchs thats renames ptlrpc_req_finished
to ptlrpc_req_put

Change it as part of a general refactor of the ptlrpc
request put/freeing code.

Lustre-change: https://review.whamcloud.com/53648
Lustre-commit: 1c25cb7a3e3db17a65a8560915a0b79ada05a351

Test-Parameters: trivial
Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I3f897b74debe383c4efb25c9a0becc1c27faa3d9
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <patrick.farrell@oracle.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/55496
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>