Description of problem:

We should have the generic config class where we can set parameters for which there is no specific implementation, like for nova in:
https://github.com/openstack/puppet-nova/blob/master/manifests/config.pp#L7

# [*nova_config*]
#   (optional) Allow configuration of arbitrary Nova configurations.
#   The value is an hash of nova_config resources. Example:
#   { 'DEFAULT/foo' => { value => 'fooValue'},
#     'DEFAULT/bar' => { value => 'barValue'}
#   }
#   In yaml format, Example:
#   nova_config:
#     DEFAULT/foo:
#       value: fooValue
#     DEFAULT/bar:
#       value: barValue


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