LU-13258 ptlrpc: bind pinger workqueue to CPT set

LU-13258 ptlrpc: bind pinger workqueue to CPT set

Lustre uses a pinger to determine if nodes are available which is
done using a workqueue. The workqueue can currently run on any
core. This has performance impact on applications but this can be
avoided by binding the workqueues to the cores Lustre as set aside
for its self. Additionally create a proper kernel config option
for enabling the pinger.

Change-Id: I6fefb0f1fd266ef4ac7016f092fe9e7908f010e9
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/38091
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>