Make lockmem a per job option

We need to get rid of per job options that fiddle with global
state. It's confusing, and it breaks remote option handling.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/thread_options.h b/thread_options.h
index e9c67ee..5eb4a20 100644
--- a/thread_options.h
+++ b/thread_options.h
@@ -126,6 +126,7 @@
 	unsigned long long zone_range;
 	unsigned long long zone_size;
 	unsigned long long zone_skip;
+	unsigned long long lockmem;
 	enum fio_memtype mem_type;
 	unsigned int mem_align;