get_package_dependencies needs to be refactored

[kallisti5]

It appears the entire reason the url exists in the repo file (BRepositoryInfo blob) is to appease the get_package_dependencies binary. The requirements of get_package_dependencies could be greatly cleaned up.

Current Behaviour

get_package_dependencies takes in the following arguments:

• Several binary local repo files which contain the url, and repo package inventory
  • These are pretty much ​http://packages.haiku-os.org/haikuports/master/repo/x86_64/current/repo generated from ​http://packages.haiku-os.org/haikuports/master/repo/x86_64/current/repo.info.
• --
• Every local hpkg file to be placed into the image.

get_package_dependencies then 'solves' the dependencies and links to where the package should be based on the url in repo.info.

get_package_dependencies seems to be the only thing that actually uses the url field in the repo.info / repo manifest. (this url field makes repo's unportable to other locations)

How it should work

• A series of remote repo URL's are provided to the tool
  • Tool downloads repo manifest from each remote repo.
  • Tool now knows "where repos exist, and what packages they contain"
• --
• Every local hpkg file to be placed into the image.