[PATCH] Use /dev/urandom instead of /dev/random

We are not cryptographic software, and with many threads it's
actually possible to run out of entropy.
diff --git a/fio-ini.c b/fio-ini.c
index 9b9262c..6f866df 100644
--- a/fio-ini.c
+++ b/fio-ini.c
@@ -280,7 +280,7 @@
 	unsigned long seed;
 	int fd, num_maps, blocks;
 
-	fd = open("/dev/random", O_RDONLY);
+	fd = open("/dev/urandom", O_RDONLY);
 	if (fd == -1) {
 		td_verror(td, errno);
 		return 1;