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.
Add collate as a new managable parameter, and extend self.instances to
add in all parameters when checking existing databases. It also adds
self.prefetch in order to speed up Puppet runs.
Provider is also switched to using mk_resource_methods to generate
all the resource readers, and exists? and other methods now use the
property_hash where appropriate.
Tests rewritten to handle changes and extend code coverage.
