Use instance variables in puppet template

Using local ruby variables in puppet ERB templates was deprecated in
puppet 3 and doesn't work any more in puppet 4. Access these values as
ruby instance variables instead.

Change-Id: I12f294d353066ff4af211b9823398a5084a585ee

modules/openstack_project/templates/review-dev.projects.ini.erb

@@ -1,11 +1,11 @@
 [projects]
 homepage=http://openstack.org
 acl-dir=/home/gerrit2/acls
-local-git-dir=<%= local_git_dir %>
-jeepyb-cache-dir=<%= jeepyb_cache_dir %>
-gerrit-host=<%= fqdn %>
+local-git-dir=<%= @local_git_dir %>
+jeepyb-cache-dir=<%= @jeepyb_cache_dir %>
+gerrit-host=<%= @fqdn %>
 gerrit-user=openstack-dev-project-creator
-gerrit-key=<%= ssh_project_key %>
+gerrit-key=<%= @ssh_project_key %>
 github-config=/etc/github/github-projects.secure.config
 has-wiki=False
 has-issues=False