Extend keystone example
Extend keystone example

This commit fixes the keystone mysql example
by ensuring that a mysql::server is installed.

It also adds the keystone default roles for robustness.

zhaochao/fuel-library,SmartInfrastructures/fuel-library-dev,eayunstack/fuel-library,stackforge/fuel-library,xarses/fuel-library,huntxu/fuel-library,zhaochao/fuel-library,stackforge/fuel-library,slystopad/fuel-lib,SmartInfrastructures/fuel-library-dev,SmartInfrastructures/fuel-library-dev,eayunstack/fuel-library,Metaswitch/fuel-library,huntxu/fuel-library,stackforge/fuel-library,Metaswitch/fuel-library,SmartInfrastructures/fuel-library-dev,Metaswitch/fuel-library,eayunstack/fuel-library,zhaochao/fuel-library,huntxu/fuel-library,slystopad/fuel-lib,ddepaoli3/fuel-library-dev,slystopad/fuel-lib,zhaochao/fuel-library,huntxu/fuel-library,stackforge/fuel-library,ddepaoli3/fuel-library-dev,ddepaoli3/fuel-library-dev,SmartInfrastructures/fuel-library-dev,Metaswitch/fuel-library,zhaochao/fuel-library,xarses/fuel-library,xarses/fuel-library,eayunstack/fuel-library,eayunstack/fuel-library,slystopad/fuel-lib,huntxu/fuel-library,ddepaoli3/fuel-library-dev,xarses/fuel-library,ddepaoli3/fuel-library-dev