Set the right permissions for signing_dir in tests

This partially fixes a bug with permissions warnings being logged
during the tests.

Change-Id: Ia399a52a49a0ca9d6b74ea90147beea42a36b24d
Partial-Bug: #1219480
Handle Token/Endpoint authentication

This is essentially the Admin token where your authentication will
always use a given token and have no means of querying information from
within that token blob.

Change-Id: Ia4317836d6fc1e62c65a1dcbd84c820d90832dc4
Merge "Handle Token/Endpoint authentication"
Merge "Set the right permissions for signing_dir in tests"