Remove use of deprecated include_class matcher

include_class is deprecated since rspec-puppet 1.0.0.
contain_class should be used instead.

Closes-bug: #1263617
Change-Id: I517be522ee52abc3c8bbecbd0ad82958516f9100
Merge "Remove use of deprecated include_class matcher"
Merge git://github.com/puppetlabs/puppetlabs-glance