Add description of resources in openstack folder
of heat engine. It should help users to understand
which resource is need to.
Resources' services updated in this patch:
* barbican
* ceilometer
* cinder
* designate
* glance
* heat (partial)
* keystone
* magnum
* mistral
* monasca
* neutron (one resource)
implements bp docstring-improvements
Change-Id: I68813427ef8944cc7b05f1d8dcf12190d3ca45d1