Adding keywork-column tests

localtests/keyword-column/create.sql

@@ -0,0 +1,13 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  i int not null,
+  color varchar(32),
+  primary key(id)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+
+insert into gh_ost_test values (null, 11, 'red');
+insert into gh_ost_test values (null, 13, 'green');
+insert into gh_ost_test values (null, 17, 'blue');

localtests/keyword-column/extra_args

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+--alter='add column `index` int unsigned' \

localtests/keyword-column/ghost_columns

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+id, i, color

localtests/keyword-column/orig_columns

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+id, i, color