Added missing import for unittest

Change-Id: I6a666557bf02aa48d4c0d58273fe0744fe91b888
Updated tests for pecan 0.6.0

Pecan 0.6.0 changes http return codes for calls that return empty
data.  Previously it returned 200, now it returns 204.  This change
was done to be in compliance with RFC2616.  For more information,
see http://pecan.readthedocs.org/en/latest/changes.html#id1 and
http://www.ietf.org/rfc/rfc2616.txt

Change-Id: Ie83b6422a5b2635efc96ef04bfaa997d8c5edb69
Merge "Added missing import for unittest"
Merge "Updated tests for pecan 0.6.0"