Made a test case on working with privileges on columns such as FIRST, ID, KEY, LAST, ORDER, etc.

[maximmasiutin]

This pull request contains a case that illustrates privileges on columns with names such as FIRST, ID, KEY, LAST, ORDER, etc.

It illustrates #219. For example, MySQL does not allow the table column name key without backticks in grants.

This test on a valid terraform file gives the following error:

resource_grant_test.go:170: Step 3/12 error: Error running apply: exit status 1
  Error: failed updating privileges: Error 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'KEY, LAST, ORDER) ON `tf-test-27`.`tbl` TO 'jdoe-tf-test-27'@'example.com'' at line 1

    with mysql_grant.test,
    on terraform_plugin_test.tf line 24, in resource "mysql_grant" "test":
    24: resource "mysql_grant" "test" {

  testing_new.go:85: Error running post-test destroy, there may be dangling resources: exit status 1

Error: error revoking REVOKE SELECT(FIRST, ID, KEY, LAST, ORDER) ON `tf-test-27`.`tbl` FROM 'jdoe-tf-test-27'@'example.com': Error 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'KEY, LAST, ORDER) ON `tf-test-27`.`tbl` FROM 'jdoe-tf-test-27'@'example.com'' at line 1

The test first creates the table with the following columns:

(c1 INT, c2 INT, c3 INT, c4 INT, c5 INT, `id` INT, `key` INT, `order` INT, `type` INT, `status` INT, `created` INT, `updated` INT, `user` INT, `name` INT, `group` INT, `value` INT, `index` INT, `source` INT, `date` INT, `state` INT, `last` INT, `first` INT, `email` INT, `phone` INT, `amount` INT, `reference` INT, `reason` INT, `hash` INT, `team` INT, `case` INT, `uid` INT, `path` INT)

The table creates successfully. Then, on granting privileges on columns, there is an error.

The privilege being granted is the following:

SELECT (`id`,`key`,`order`,`first`,`last`)

[petoju]

I believe this is included in just merged #222 - so closing it