Adapt puppet module ntp for Fuel

Rename template name for ntp.
Strictly, in current implementation (v3.1.1), ntp module not need for explicit declare config_template var,
cause all logic from templates was moved to manifests (class ntp::params) and now it's only one template,
declared by default.
But since we don't want to change upstream modules and in declaration of 'openstack::clocksync'
config_template have default value as 'undef', so we need to save declare of this value at our module.

Change-Id: I8f9ac3bdacbd5512224bb4b1a5b9214bed54093c
Implements: blueprint merge-openstack-puppet-modules
Merge "Adapt puppet module ntp for Fuel"