ISPN-4567 Add arquillian debug for AS Client modules tests

* This is done to get more information out of the arquillian
lifecycle events for when this issue appears again.
ISPN-4766 Cache can't start if coordinator leaves during join
and joiner becomes the new coordinator
ISPN-4756 Upgrade to protobuf-2.6.0 and protostream-2.0.0.Alpha3
ISPN-4357 Use a specific cache for managing protofiles