This update for mksusecd fixes the following issues:

Update from version 1.71 to version 1.77

- fix add_on_products.xml handling (bsc#1176379)
- look only at top-level products file (bsc#1176176)
- ensure modified files really end up on the media (bsc#1176176)
- adjust product handling if products are spread over several media
- include complete product directories
- fix product handling with new SLE full media layout
- added "--sign-pass-file"
- added option for recreating and signing the repo
- remove "all done" message
- additional passphrase options are not necessary at key creation
- set additional options only when a existing sign key is specified
- print message if --sign-pass-file and missing sign-key
- removed sign_passwd_option on import
- add --sign-key-id option to allow specifying a gpg signing key by id
- do not include excluded products (bsc#1173263)
- recreate products file, including its checksum update
- Fix broken link to kiwi documentation

This update was imported from the SUSE:SLE-15-SP1:Update update project.