Enforce granular role-based access control for configuration functions

Enforce granular role-based access control for configuration functions:

	Cluster User	Service Operator	Service Administrator	Cluster Operator	Cluster Administrator	Administrator
View service configurations
Compare service configurations
Manage configuration groups
View host configuration
View cluster configuration

Entry points affected:

• GET /api/v1/clusters/:clusterId/configurations
• POST /api/v1/clusters/:clusterId/configurations
• GET /api/v1/clusters/:clusterId/configurations/service_config_versions
• GET /api/v1/clusters/:clusterId/config_groups
• GET /api/v1/clusters/:clusterId/config_groups/:groupId
• POST /api/v1/clusters/:clusterId/config_groups
• PUT /api/v1/clusters/:clusterId/config_groups/:groupId
• DELETE /api/v1/clusters/:clusterId/config_groups/:groupId