LU-8066 ptlrpc: move sptlrpc procfs entry to debugfs

LU-8066 ptlrpc: move sptlrpc procfs entry to debugfs

We might want eventualy split it into a bunch of
single-value sysfs entries, I imagine, but there is no urgent need now.

Linux-commit : 77386b3c0b4470db1ed546de858b31cac66fc943

Migrate the GSS stuff to debugfs as well.

Test-Parameters: envdefinitions=SHARED_KEY=true testlist=sanity,recovery-small,sanity-sec

Change-Id: I417d3a46aa21cd7dca7cb8f7b6fd78623d726bed
Signed-off-by: Dmitry Eremin <dmiter4ever@gmail.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/30963
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>