Remove deprecated parameters

* nova::api::auth_strategy (deprecated since 4.0.0)
* nova::api::workers (deprecated since 4.0.0)
* nova::compute::libvirt::libvirt_type (deprecated since 4.0.0)
* nova::db::mysql::cluster_id (deprecated since 4.0.0)
* nova::nova_cluster_id (deprecated since 4.0.0)
* nova::nova_group_id (deprecated since 4.2.0)
* nova::nova_user_id (deprecated since 4.2.0)
* nova::nova_shell (deprecated since 4.2.0)
* nova::sql_connection (deprecated since 3.0.0)
* nova::sql_idle_timeout (deprecated since 3.0.0)
* nova::logdir (deprecated since 3.2.0)
* nova::monitoring_notifications (deprecated since 4.0.0)
* nova::keystone::auth::cinder (deprecated since 3.0.0)

Change-Id: I31e8517b2a25febc9f6cd01197be279ee772ebce