Remove deprecated parameters

* glance::api::sql_connection (deprecated since 4.1.0)
* glance::api::sql_idle_timeout (deprecated since 4.1.0)
* glance::registry::sql_connection (deprecated since 4.1.0)
* glance::registry::sql_idle_timeout (deprecated since 4.1.0)

Change-Id: Ibfe4e1a0a9f2f9f79b3fc76ef6a93ce429f72ed4
Merge "Remove deprecated parameters"