Add new plugin for openstack-heat
Merge branch 'master' of github.com:jpeeler/sosreport into jpeeler-master

Note: Changed original filename from openstack-heat.py to openstack_heat.py as
the plugin would fail to load with the original filename.

Closes #190

Signed-off-by: Jeff Peeler <jpeeler@redhat.com>
Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>