The user now requires SELECT privileges on the mysql.roles_mapping
table.
Currently this is a mandatory grant but it needs to be made into an
optional requirement. This allows upgrades from 2.2.9 to 2.2.10 without
needing new grants.
Made the document more concise and added links to the download page. Made
the user grants easier to copy-paste and explained that they are used in
the following tutorials. Updated the links to the new tutorials.
The read-write splitting routing tutorial is a combination of the two
different read-write splitting routing tutorials. As with the connection
routing tutorial, this should reduce the maintenance burden.
