Bump akka management api version.

[rabbah]

Description

Related issue and scope

• I opened an issue to propose and discuss this change (Upgrade dependencies to reduce downstream conflicts #5132)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[ddragosd]

LGTM too. Thanks @rabbah !

[rabbah]

In case it's cleaner, I created a separate PR just for the Mesos removal. We'll see based on feedback from dev list. This PR might be reduced to just one or two lines if so.

[rabbah]

The build is unhappy with the last commit. Will check into it. The mesos bit is ok.