Use upstream config_template collection

Use upstream config_template collection

In order to reduce need of module
internal maintenance and to join forces on plugin development,
it's proposed to switch to using upstream version of
config_template module.

As it's shipped as collection, it's installation for end-users
is trivial and aligns with general approach of shipping extra modules.

Signed-off-by: Dmitriy Rabotyagov <noonedeadpunk@ya.ru>