A few improvements to Eureka CLI, to speed up manual testing process.
Implement interest channel upgrade.
Merge remote-tracking branch 'remotes/netflix/2.x' into tbak/2.x

Conflicts:
	eureka-test-utils/src/main/java/com/netflix/eureka/cmd/EurekaCLI.java
Fix bug in InterestNotificationMultiplexer.
Merge pull request #194 from tbak/2.x

2.x Interest channel upgrade