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Allow one auth source that is passed in 'Authorization' header (it can
be: GAIA token, DM token or enrollment token) and one auth source that
is passed as query param (it can be OAuth2 token).
It will be further used to fetch child user policy with DMToken and
user OAuth2 token.

This is a part of larger change: passing credentials with child user policy
fetch.

Bug: 839025
Test: DeviceManagementRequestAuthTest/DeviceManagementServiceTest/DeviceManagementServiceIntegrationTest + manually
Change-Id: I84d77822452b6c1a320b30627cf7dfe54462f986
Reviewed-on: https://chromium-review.googlesource.com/c/1341063Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612834}