Setting tag sfa-2.1-27

Setting tag sfa-2.1-27
-- core
Extend all versions of rspecs in order to support "links" and "channels" management methods
several fixes aroung Rspecs in order to make the code usable by 3rd-party tools
expose PL node tags in PGv2 and GENIv3 rspecs
fix default slivers mgt in sfav1 rspecs
fix SM and AM urn format in GetVersion
fix sfaadmin.py to handle extra testbed-dependent info
-- PlanetLab
Better management of external Slices/Persons/Sites
Importer ignores external Slices/Persons/Sites
-- Nitos
uniformize Leases management
address channels with urn
-- IotLab
Renaming slab folders, files and variables to iotlab, the new name of the platform.
New class ParsingResourcesFull in Oarrestapi file. Contain all the parsing nodes functions.
Adding a mobile field to iotlab rspec and a mobility type attribute .
Granularity changed to 60 sec.
Fixing returned rspec in GetSlices and GetLeases.
Corrections in import (importing nodes)
More testis in script files under testbeds/iotlab/tests . Creation of Rspecs request models under r testbeds/iotlab/tests /tests_rspec
Lease filtering by date added in GetLeases.
Commenting and cleaning