Create a new class to handle the keystone authtoken configuration
utilizing the keystone::resource::authtoken resource.
Some deprecations:
- gnocchi::api::keystone_user is deprecated in favor of
gnocchi::keystone::authtoken::username.
- gnocchi::api::keystone_password is deprecated in favor of
gnocchi::keystone::authtoken::password.
- gnocchi::api::keystone_tenant is deprecated in favor of
gnocchi::keystone::authtoken::project_name
- gnocchi::api::keystone_identity_uri is deprecated in favor of
gnocchi::keystone::authtoken::auth_url.
- gnocchi::api::keystone_auth_uri is deprecated in favor of
gnocchi::keystone::authtoken::auth_uri
Change-Id: I7be1c8f471472e74642e25508c6871d0f948d75b
Related-Bug: #1604463