Make sure example apps work with cflinuxfs4, and remove unused apps

[ebroberson]

• Removing diglett as it is not used
• Removing Eureka as it is not used any more
• Removing reference to Eureka example app
• add example output data for raw response app
• add reference to raw-response app to docs
• remove old service discovery alternative example apps
• Removing smoke app since it isn't used any more
• Added README