Enable hipchat section into sample file

Current sample file lacks section about hipchat. Add section
with dummy token to show hipchat usage.

Added that into default config file for cmd.py, that is the
one used for testing. This will allow to properly test
jobs with hipchat module enabled.

Closes-Bug: #1366063

Change-Id: If511486a69113a4b4300cdb3602154ef261bc18a
Adds credentials-binding plugin support to wrappers

Add support for configuring the credentials binding plugin.
The credentials binding plugin can be found at
https://wiki.jenkins-ci.org/display/JENKINS/Credentials+Binding+Plugin

Change-Id: I94fef65f3960f3b357d1a1a4f3f25dfecb739164
Merge "Adds credentials-binding plugin support to wrappers"
Merge "Enable hipchat section into sample file"