Release 5.0.0 - Juno

Changes in this release:
* Added package_ensure parameters to various classes to control package installation
* Added ceilometer::policy to control policy.json
* Updated validate_re expressions for Puppet 3.7
* Bumped stdlib dependency to >=4.0.0
* Added manage_service parameters to various classes to control whether the service was managed, as well as added enabled parameters where not already present
* Added parameters to control whether to configure users
* Added the ability to override the keystone service name in keystone::auth
* Migrated the ceilometer::db::mysql class to use openstacklib::db::mysql and deprecated the mysql_module parameter
* Fixed ceilometer-notification package name for RHEL
* Removed deprecation notices for sectionless ceilometer_config types for Juno release
* Added ability to hide secrets from puppet logs

Change-Id: Ifda9dba6ef8a9eb99d1a5d2bf45aa74b210675dc