Get the sample config files from stable/icehouse

Since the configuration reference is versioned, get the sample files
from the git stable/icehouse branch. This should avoid grabbing trunk
config files when building backports.

Closes-Bug: #1308452
Change-Id: Id7e38ec69345b8a47d48ce6308440a2ec47d8914
Merge "Get the sample config files from stable/icehouse"