[COOK-3441] Make user password optional

Signed-off-by: Sean OMeara <someara@opscode.com>
Version bump to 2.0.0
Publish 2.0.0 Changelog
Updating mysql cookbook dependency, enforcing the rubocops
Version bump to 2.1.0
Publish 2.1.0 Changelog
Version bump to 2.1.1 (for development)
depending on mysql-chef_gem
Merged upstream.