Undeprecate keystone::endpoint class

This class should not be deprecated in favor of
keystone::resource::service_identity as we have no way
to configure keystone::resource::service_identity through Hiera yet.

It would be the equivalent of deprecating all *::keystone::auth
in all our modules which was not our intention by introducing
the common keystone::resource::service_identity resource.

Change-Id: Ib424ac9b2c1e61e1e39fe56fd1adfe552110fcb8
Remove deprecated parameters

* keystone::endpoint::public_port (deprecated since 4.0.0)
* keystone::endpoint::public_protocol (deprecated since 4.0.0)
* keystone::endpoint::public_address (deprecated since 4.0.0)
* keystone::endpoint::internal_address (deprecated since 4.0.0)
* keystone::endpoint::internal_port (deprecated since 4.0.0)
* keystone::endpoint::admin_address (deprecated since 4.0.0)
* keystone::endpoint::admin_port (deprecated since 4.0.0)
* keystone::sql_connection (deprecated since 4.1.0)
* keystone::idle_timeout (deprecated since 4.1.0)
* keystone::bind_host (deprecated since 4.0.0)
* keystone::token_format (deprecated since 3.0.0)

Change-Id: I8b8ed42d4d81aa8091f2fae38f05cb74428051a9