Fix reference to middleware architecture doc

The auth_token docstring was referencing the middleware architecture
doc in keystoneclient. Updated to the new location.

Change-Id: I495bc332230f75e579e03c1b6f8feba49a26e5bf
Remove HTTP_X_STORAGE_TOKEN doc

This header isn't referenced in the code so remove it from the
documentation.

Change-Id: I77c5432d4d7a31422c75f9d675ec0e15f6c1164d
Changing the value type of http_connect_timeout

The value type of http_connect_timeout definition
is changed from Bool to Int value. Python treats
a value more than 1 as True but oslo config defines
Boolean values as 'true, '1', 'yes' and 'on'.
So http_connect_timeout is only configured 1 or None.

Change-Id: I53075cc04d0ccea543f8e657279534208ed03058
Closes-bug: #1368545
Merge "Changing the value type of http_connect_timeout"
Merge "Fix reference to middleware architecture doc"
Merge "Remove HTTP_X_STORAGE_TOKEN doc"