Updated puppetlabs-mysql module

We need to have latest packstack/icehouse branch to be able to set innodb
performance configuration

Fixes: rhbz#1150104

packstack/puppetlabs-mysql@66ee332 Removed comma breaking manifests
packstack/puppetlabs-mysql@a209a0c Adds Scientific Linux 7 Support
packstack/puppetlabs-mysql@a0bd625 Fixes Facts string comparisons in CentOS 7
packstack/puppetlabs-mysql@bf8dd38 max_connections default to 1024
packstack/puppetlabs-mysql@ddeed6f Sets open_files_limit to -1 (autosized)
packstack/puppetlabs-mysql@6900ddf Added open_files_limit parameter
packstack/puppetlabs-mysql@c914319 Allow max_connections settings
packstack/puppetlabs-mysql@5458850 Parametrize !includedir
packstack/puppetlabs-mysql@cfbba57 Fix mariadb Fedora package name