The default bind_port (6011-6013) in the sample config files for swift
use port numbers that are in the range registered by X11 (6000-6063) and
can prevent swift from starting if the ports are in use.
We should use an unregistered range (6611-6613).
Change-Id: Ifd95b99004aead5ddc8ae1a8dd3ccd9c4f2abe91
Closes-Bug: #1254328