This update for rmt-server fixes the following issues:

Update from version 2.6.5 to version 2.6.8

- Fixing wrong handling of `ids` starting with numeric characters. (bsc#1182736)
- Clean out `subscriptions` table only if the replacement data is already available. (bsc#1183615)
- Raise an error when there is an extension activated which has no migration successor (like LTSS).
- Include installed modules to the solution tree when doing an offline migration. (bsc#1179523)
- Do not raise an exception when mirroring if some information missing is in alpha or beta stage. (bsc#1180018)
- Fix `rpath` build issues.
- Add filter options for product listing and bash completion for new flags

This update was imported from the SUSE:SLE-15:Update update project.