Added "require" to the global mysql.rb file like in the other provider files.
defaults-file changed to defaults-extra-file in all the database_* (old) providers, the same as in the mysql_* providers.
Changed defaults-file to defaults-extra-file in all test files
Should load the .my.cnf file with "--defaults-extra-file" instead of "--defaults-file". This is necessary if we have global my.cnf file but we want to use both of them.
This provider has undergone the largest set of changes and currently
just accepts a full SQL grant string as the name and then applies it,
making things easier for DBAs and removes the awkward attempts at
modelling grants into Puppet.
