Name archive for bundle if available

Problem/Motivation

Currently if generating multiple features that are part of a bundle that is not an install profile, the file name given is generated_features.tar.gz. Since the bundle has a machine name, it would be more expected to name the archive for the bundle.

Proposed resolution

Alter the file naming logic in FeaturesGenerationArchive::generate() to use the bundle name as appropriate.

Remaining tasks

User interface changes

API changes

Data model changes