Auto-load the latest version only (#2158)
Auto-load the latest version only (#2158)

This change fixes an issue where configuration can be loaded multiple times.
It changes the auto-loading mechanism to only load once per gem.

[fixes #2153]
googleapis/google-cloud-ruby,quartzmo/gcloud-ruby,blowmage/gcloud-ruby,googleapis/google-cloud-ruby,googleapis/google-cloud-ruby,quartzmo/google-cloud-ruby,dazuma/google-cloud-ruby,dazuma/google-cloud-ruby,dazuma/google-cloud-ruby,googleapis/google-cloud-ruby,quartzmo/google-cloud-ruby,dazuma/google-cloud-ruby,googleapis/google-cloud-ruby,quartzmo/google-cloud-ruby,quartzmo/google-cloud-ruby,dazuma/google-cloud-ruby,googleapis/google-cloud-ruby,dazuma/google-cloud-ruby,quartzmo/google-cloud-ruby,quartzmo/google-cloud-ruby