Traffic Distributtion support added

Traffic Distributtion support added

* New local polcies for vFW TD use case
* Fixed encoding for conductor_request template and parameters
  section modified to accept all requestParameters
* Conductor request can have many attributes in the
  'attributes' section - all that are defined in the vnf policy file
* Conductor request can have many request parameters in the
  'requestParameters' section. The parameters come from QueryPolicies.
  Before list of suppoted parameters was hardcoded
* Optional 'unique' parameter added to the placementDemand section.
  It is already supported by conductor for all inventory types
* Improved debug logs for local policies
* Unit tests added for expanded request format

Change-Id: I41f219c366a3a77881c7096e64a6272edbada23b
Issue-ID: OPTFRA-443
Signed-off-by: Lukasz Rajewski <lukasz.rajewski@orange.com>