Tooltool fetching can now use LDAP credentials from a file

You can now fetch tooltool files by using an authentication file.
All you have to do is append "--authentication-file file" to your tooltool fetching command.

• Tooltool change
• Mozharness change

This is important if you want to use automation to fetch files from tooltool on your behalf.
This was needed to allow Android test jobs to run locally since we need to download tooltool files for it.

EDIT: Fixed the tooltool hyperlink
EDIT: Removed labels to avoid re-posting after edit

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This work by Zambrano Gasparnian, Armen is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.