Fix api_paste_config typo in cinder.conf.erb

Cinder config template.conf.erb has typo which causes api-paste.ini to be ignored.

- Change api_paste_confg to api_paste_config in cinder.conf.erb
  template

  See rcbops/chef-cookbooks#900
Merge pull request #95 from claco/issue-900

Merged automatically by jenkins after successful build test