branches/zip: Reduce WAIT_FOR_READ from 20 to 5 milliseconds, to correspond

to the time in which modern disks can serve a random disk read.

buf/buf0buf.c

@@ -203,7 +203,7 @@ the read requests for the whole area.
 */
 
 /* Value in microseconds */
-static const int WAIT_FOR_READ	= 20000;
+static const int WAIT_FOR_READ	= 5000;
 
 buf_pool_t*	buf_pool = NULL; /* The buffer buf_pool of the database */