Aptomi core & model cleanup

[romangithub1024]

• Do not allow to change a cluster via API #253 Do not allow to change a cluster via API
• Introduce namespaces as entities (ACL rules should live inside a NS) #270 Introduce namespaces as entities (ACL rules should live inside a NS)
• Validate component instances during policy resolution #282 Validate component instances during policy resolution
• Add a notion of deployment target, remove NS from cluster definition #278 Add a notion of deployment target, remove NS from cluster definition
• Improve service discovery when contract is implemented via different services #205 Improve service discovery when contract is implemented via different services
• Agree on the new terminology and rename core entities #302 Agree on the new terminology and rename core entities
• Use label “target” instead of “cluster” to specify placement #303 Use label “target” instead of “cluster” to specify placement
• Remove user from dependency #307 Remove user from dependency
• Make service sharing more explicit in policy language #305 Make service sharing more explicit in policy language
• kafka.kafka in discovery + input/output parameters for the contract #306 kafka.kafka in discovery + input/output parameters for the contract
• Rework how we create/save revisions and desired state #318 Rework how we create/save revisions and desired state
• Better update logic for transferring data from desired state to actual state #321 Better update logic for transferring data from desired state to actual state
• Support clusters local to namespaces, not only in system namespace #335 Support clusters local to namespaces, not only in system namespace
• Figure out EdgesIn & EdgesOut in actual state #327 Figure out EdgesIn & EdgesOut in actual state