Add EXPR PLUS region table and Maat_set_scan_status function to indicate the district.

test/table_info.conf

@@ -1,7 +1,7 @@
 #each collumn seperate with '\t'
 #id	(0~65535)
 #name string
-#type one of ip,expr,digest,intval,compile or plugin
+#type one of ip,expr,expr_plus,digest,intval,compile or plugin
 #src_charset one of GBK,BIG5,UNICODE,UTF8
 #dst_charset combined by GBK,BIG5,UNICODE,UTF8,seperate with '/'
 #do_merege yes or no
@@ -14,3 +14,4 @@
 5	CONTENT_SIZE	intval	GBK	GBK	no	0
 6	QD_ENTRY_INFO	plugin	GBK	GBK	no	0
 7	FILE_DIGEST	digest	GBK	GBK	no	0
+8	HTTP_REGION	expr_plus	GBK	GBK	no	0