Run offliner tests with Fuse 7.11 AR26

More information about offliner can be found on confluence

Get the link for redhat-fuse-XXX-offline-manifest.zip from staging
Run offliner create repository to build the repository first
Run features with offliner to check all karaf features are installable with offline repository
Run quickstarts with offliner to check all quickstart can be built and installed with offline repository