WIP: Don't use 'puppetlabs-mysql' plugin to create MySQL db/users

The MySQL db admin machines are throwing a SQL syntax error when
puppet tries to create the database user. The error is below, with
the password hash omitted:

```
Error: /Stage[main]/Govuk::Apps::Collections_publisher::Db/Mysql::Db[collections_publisher_production]/Mysql_user[collections_pub@%]/ensure: change from absent to present failed: Execution of '/usr/bin/mysql --defaults-extra-file=/root/.my.cnf --database=mysql -e CREATE USER 'collections_pub'@'%' IDENTIFIED BY PASSWORD '(omitted)'' returned 1: ERROR 1064 (42000) at line 1: 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 'PASSWORD '(omitted)'' at line 1
```

It looks like 5.6 allowed the IDENTIFIED BY PASSWORD syntax:
https://dev.mysql.com/doc/refman/5.6/en/create-user.html

But 8.0 is just IDENTIFIED BY:
https://dev.mysql.com/doc/refman/8.0/en/create-user.html

And that doesn't look overridable in the puppet module:
https://github.com/puppetlabs/puppetlabs-mysql/blob/a48069e89a4c06abccbb3595d2c782c7cd6e3254/lib/puppet/provider/mysql_user/mysql.rb#L66-L78

puppetlabs-mysql dropped support for the Puppet version we use
before they put in [the fix](puppetlabs/puppetlabs-mysql#1092)
for creating users with MySQL 8, so upgrading is not an option.

modules/govuk/manifests/node/s_collections_publisher_db_admin.pp

@@ -29,6 +29,10 @@
     content => template('govuk/mysql_my.cnf.erb'),
   }
 
-  # include all MySQL classes that create databases and users
-  -> class { '::govuk::apps::collections_publisher::db': }
+  # TODO: automate - or document how to - create the MySQL DB & user
+  # mysql::db {'collections_publisher_production':
+  #   user     => 'collections_pub',
+  #   host     => '%',
+  #   password => $mysql_password,
+  # }
 }

modules/govuk/manifests/node/s_contacts_admin_db_admin.pp

@@ -29,6 +29,10 @@
     content => template('govuk/mysql_my.cnf.erb'),
   }
 
-  # include all MySQL classes that create databases and users
-  -> class { '::govuk::apps::contacts::db': }
+  # TODO: automate - or document how to - create the MySQL DB & user
+  # mysql::db { 'contacts_production':
+  #   user     => 'contacts',
+  #   host     => '%',
+  #   password => $mysql_contacts_admin,
+  # }
 }

modules/govuk/manifests/node/s_release_db_admin.pp

@@ -29,6 +29,10 @@
     content => template('govuk/mysql_my.cnf.erb'),
   }
 
-  # include all MySQL classes that create databases and users
-  -> class { '::govuk::apps::release::db': }
+  # TODO: automate - or document how to - create the MySQL DB & user
+  # mysql::db {'release_production':
+  #   user     => 'release',
+  #   host     => '%',
+  #   password => $mysql_release,
+  # }
 }

modules/govuk/manifests/node/s_search_admin_db_admin.pp

@@ -29,6 +29,10 @@
     content => template('govuk/mysql_my.cnf.erb'),
   }
 
-  # include all MySQL classes that create databases and users
-  -> class { '::govuk::apps::search_admin::db': }
+  # TODO: automate - or document how to - create the MySQL DB & user
+  # mysql::db {'search_admin_production':
+  #   user     => 'search_admin',
+  #   host     => '%',
+  #   password => $mysql_search_admin,
+  # }
 }

modules/govuk/manifests/node/s_signon_db_admin.pp

@@ -29,6 +29,10 @@
     content => template('govuk/mysql_my.cnf.erb'),
   }
 
-  # include all MySQL classes that create databases and users
-  -> class { '::govuk::apps::signon::db': }
+  # TODO: automate - or document how to - create the MySQL DB & user
+  # mysql::db {'signon_production':
+  #   user     => 'signon',
+  #   host     => '%',
+  #   password => $mysql_signonotron,
+  # }
 }

modules/govuk/manifests/node/s_whitehall_db_admin.pp

@@ -29,6 +29,16 @@
     content => template('govuk/mysql_my.cnf.erb'),
   }
 
-  # include all MySQL classes that create databases and users
-  -> class { '::govuk::apps::whitehall::db': }
+  # TODO: automate - or document how to - create the MySQL DB & user(s)
+  # mysql::db { 'whitehall_production':
+  #   user     => 'whitehall',
+  #   host     => '%',
+  #   password => $mysql_whitehall_admin,
+  # }
+  # govuk_mysql::user { 'whitehall_fe@%':
+  #   password_hash => mysql_password($whitehall_fe_password),
+  #   table         => 'whitehall_production.*',
+  #   privileges    => ['SELECT'],
+  #   require       => Mysql::Db['whitehall_production'],
+  # }
 }