Show missing information in bundle-info

[castulo]

The bundle-info command was initially introduced by issue #1079, however some information that is planned to be displayed by the command has not been implemented yet since the information is not available to swupd. To be able to implement this functionality the info will have to be made available by mixer.

This is the information missing by the command:

• When using $ swupd bundle-info BUNDLE, a description of the bundle and its maintainer need to be displayed along with the other info that is already displayed. If the maintainer is not known None should be printed.

• When using $ swupd bundle-info --packages BUNDLE, the list of packages included by the BUNDLE should be listed. This list will include a deduplicated list of packages included by dependencies of BUNDLE (includes and also-add).

• When using $ swupd bundle-info --direct-packages BUNDLE, the list of packages directly included by the BUNDLE should be listed.

All this information is currently not available to swupd, Mixer will need to make this information available to swupd, this is tracked in separate issues: clearlinux/mixer-tools#618, clearlinux/mixer-tools#619