libalpm/dload: major refactor of signature downloading

There's a lot of related moving parts here:
* Iteration through mirrors is moved back to the calling functions. This
  allows removal of _alpm_download_single_file and _alpm_download_files.
* The download function gets a few more arguments to influence behavior.
  This allows several different scenarios to customize behavior:
  - database
  - database signature (req'd and optional)
  - package
  - package via direct URL
  - package signature via direct URL (req'd and optional)
* For databases, we need signatures from the same mirror, so structure
  the code accordingly.

Some-inspiration-from: Dave Reisner <d@falconindy.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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