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

etc/jenkins_jobs.ini-sample

@@ -9,3 +9,6 @@ password=1234567890abcdef1234567890abcdef
 url=https://jenkins.example.com
 ##### This is deprecated, use job_builder section instead
 #ignore_cache=True
+
+[hipchat]
+authtoken=dummy

jenkins_jobs/cmd.py

@@ -36,6 +36,9 @@ ignore_cache=False
 url=http://localhost:8080/
 user=
 password=
+
+[hipchat]
+authtoken=dummy
 """