Previous scenarious were obsolete.
This patch adds necessary paramater "template_path".
Also default.yaml template was added for using in this list of scenarios.
Additionally fix wrong import in sample_plugin.py
Change-Id: I31cd295d322d907883a22cddef25b5ccc609f2c1
git.openstack.org is our official server, github is just a
read-only mirror.
Linking to github might also raise the expectation that we use the usual
github workflow which is not the case.
Change-Id: I3b3e8213c264757838c8e5fd33221eebf219cdc8