Add move-tables unsigned column test

Exercise row copy and concurrent DML with signed, unsigned, and maximum
BIGINT UNSIGNED values.

Author: ericyan

localtests/move-tables/unsigned/create.sql

@@ -0,0 +1,32 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  signed_value bigint not null,
+  unsigned_value int unsigned not null,
+  unsigned_big_value bigint unsigned not null,
+  primary key(id)
+) auto_increment=1;
+
+insert into gh_ost_test (signed_value, unsigned_value, unsigned_big_value) values
+  (-9223372036854775807, 4294967295, 18446744073709551615),
+  (-9223372036854775806, 4294967294, 18446744073709551614),
+  (-9223372036854775805, 4294967293, 18446744073709551613);
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test (signed_value, unsigned_value, unsigned_big_value) values
+    (-9223372036854775804, 4294967292, 18446744073709551612);
+  update gh_ost_test
+    set signed_value=signed_value+1,
+        unsigned_value=unsigned_value-1,
+        unsigned_big_value=unsigned_big_value-1
+    where id <= 3;
+end ;;

localtests/move-tables/unsigned/tables.txt

@@ -0,0 +1 @@
+gh_ost_test