Bugfix for mysql_grant provider when we try to grant remove privileges
on PROCEDURE. Resolve for bug https://tickets.puppetlabs.com/browse/MODULES-130
(https://github.com/puppetlabs/puppetlabs-mysql/issues/378)
Add system test to cover procedure creation scenario
Merge pull request #412 from n1tr0g/master

mysql_grant fixed to properly handle PROCEDURE grants