CFY-6423 Cluster REST API changes
CFY-6423 Cluster REST API changes

- CFY-6424 Pass the config without the additional dict envelope
- CFY-6425 Use the same endpoint for starting and joining

isaac-s/cloudify-manager,cloudify-cosmo/cloudify-manager,isaac-s/cloudify-manager,cloudify-cosmo/cloudify-manager,cloudify-cosmo/cloudify-manager,isaac-s/cloudify-manager