Remove verify_pattern option, replace with verify=pattern:x

Integrate the pattern verification with the other verify types,
it's much cleaner that way.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 3bee1a2..6ece3c1 100644
--- a/HOWTO
+++ b/HOWTO
@@ -599,6 +599,15 @@
 				(timestamp, block number etc.). The block
 				number is verified.
 
+			pattern	Fill the IO buffers with a specific pattern,
+				that we can use to verify. Depending on the
+				width of the pattern, fio will fill 1/2/3/4
+				bytes of the buffer at the time. The pattern
+				cannot be larger than a 32-bit quantity. The
+				given pattern is given as a postfix to this
+				option, ala: verify=pattern:0x5a. It accepts
+				both hex and dec values.
+
 			null	Only pretend to verify. Useful for testing
 				internals with ioengine=null, not for much
 				else.
@@ -624,14 +633,6 @@
 			size of header_interval. blocksize should divide this
 			evenly.
 
-verify_pattern=int	If set, fio will fill the io buffers with this
-		pattern. Fio defaults to filling with totally random
-		bytes, but sometimes it's interesting to fill with a known
-		pattern for io verification purposes. Depending on the
-		width of the pattern, fio will fill 1/2/3/4 bytes of the
-		buffer at the time. The verify_pattern cannot be larger than
-		a 32-bit quantity.
-
 verify_fatal=bool	Normally fio will keep checking the entire contents
 		before quitting on a block verification failure. If this
 		option is set, fio will exit the job on the first observed