LU-9121 lnet: ioctl handler for get policy info

LU-9121 lnet: ioctl handler for get policy info

Add ioctl handler for GET_UDSP_SIZE and GET_UDSP

Test-Parameters: trivial testlist=lnet-selftest,sanity-lnet
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: I4e188cac92ca98c26b26e00b8917ad3632d99d06
Reviewed-on: https://review.whamcloud.com/34579
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>