watchers: add slurper for Elastic IP

Signed-off-by: Luca Bruno <luca.bruno@rocket-internet.de>
reporter: find changes for EIP

Signed-off-by: Luca Bruno <luca.bruno@rocket-internet.de>
manager: add command for EIP watcher

Signed-off-by: Luca Bruno <luca.bruno@rocket-internet.de>