Fix delay_auth_decision example values

The /etc/swift/proxy-server.conf example is broken, to enable the
feature valid values are: True, true, t, 1, on, yes, y. Thus changing
to "true". The Folsom install guide recommended turning it off, thus
using "false" instead of 0.

Change-Id: Ic10f6cdaa11f0bd5ff0957bfaf6693092c243c62
Merge "Fix delay_auth_decision example values"