Add Service Registration for REST endpoints

[Mihael Schmidt]

The configuration should support the possibility to register all endpoints at a service registry. As there are different service registries it should be configurable which service registry to use.

Interface: ServiceRegistrant

A possible service register to use could be Apache Zookeeper. The project itself also comes with a C binding for its API. There are also some community libraries in Lua, C and Python for accessing Zookeeper. Compiling one as an ILE module would enable us to register all endpoints to a Zookeeper server.

Information:

• https://zookeeper.apache.org
• https://helix.apache.org/
• http://aredko.blogspot.de/2013/10/coordination-and-service-discovery-with.html
• http://blog.arungupta.me/zookeeper-microservice-registration-discovery/
• http://curator.apache.org/
• https://cwiki.apache.org/confluence/display/ZOOKEEPER/ZKClientBindings
• https://github.com/Xorlev/gatekeeper