Align C++ publication configuration with the Java ecosystem

### Expected Behavior

Both ecosystems should behave as close as possible to avoid confusion.

### Current Behavior

There's a difference in behavior between the C++ and Java ecosystem when it comes to binary publication.

### Context

See https://gradle.slack.com/archives/C5DTC5KGC/p1526282895000210

### Steps to Reproduce (for bugs)

### Your Environment

* Build scan URL:

Start with the linked Slack discussion and compare the current C++ and Java binary publication behavior. Clarify the intended alignment and define completion as both ecosystems behaving consistently for binary publication.

Written by the indexing model from the issue text.