LU-9119 lnet: remove debug ioctl

LU-9119 lnet: remove debug ioctl

Remove a debug ioctl that was added to allow for debug
messages from user space. However, the code is currently
not being used.

Test-Parameters: trivial
Signed-off-by: Amir Shehata <amir.shehata@intel.com>
Signed-off-by: Olaf Weber <olaf@sgi.com>
Change-Id: Ifd2bee73ef507bd07296af76dac1caf08ded9e64
Reviewed-on: https://review.whamcloud.com/26688
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>