Add benchmark for kGraft: getpidbench

Signed-off-by: Jan Moskyto Matejka <mq@suse.cz>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Tunings: added kgraft tuning

Specify the kgraft patch package in the config file as URL.
The tuning inserts all the patches one after another.

Known problem:
as of now, the patching sometimes doesn't finish because of missing annotations
	-> added a configurable timeout after which the kgraft tuning fails at all

Signed-off-by: Jan Moskyto Matejka <mq@suse.cz>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Tunings: better fail than produce bad data

Signed-off-by: Jan Moskyto Matejka <mq@suse.cz>
Signed-off-by: Mel Gorman <mgorman@suse.de>