Upgrade to Karaf to fix feature repo version ranges

[brjeter]

Hardcoding the DDF version for the feature repos (https://github.com/connexta/admin-console/blob/master/features/admin-query/src/main/feature/feature.xml#L20) causes downstream projects to start that version of features in addition to starting DDF features for the version that the downstream project points to. Effectively, the system ends up starting duplicate DDF features, some for the version that admin-console points to and some for the version that the downstream project points to.

This can be fixed by changing the feature repos to use a version range instead. However, there is a current bug in Karaf that breaks this use-case: https://issues.apache.org/jira/browse/KARAF-6294. Once this bug is fixed, we should use version ranges for the feature repos.