Setting tag sfa-3.1-2

Setting tag sfa-3.1-2
-- Core
added support for geni_extend_alap (as long as possible) in RenewSliver.
adding support for geni_speaking_for option,
-- RSpecs
Add support for Ofelia OpenFlow RSpecs
-- PlanetLab
Set Admins as PI's of the top authority while importing.
-- IoTLab
Iotlab and cortexlab ported to geni-v3.
Moving methods using the SFA db and api object from Shell to Driver.
Propagating the changes in iotlabimporter, iotlabaggregate and iotlabslices.
Iotlab now using sfa database for the special table lease_table.
Using alchemy.py classes to create a session to the DB.
Cleaning and documenting.
Fix Allocate() API call
-- client
handle single slivers.
fix sfi.py version and trusted.
-- PlanetLab
handle single slivers by Provision(), Delete() and PerformOperationalAction().
fix foreign slices mgt in sliver_to_slice_xrn() and check_sliver_credentials().
wider mgt of new slice url and description.
-- Packaging
rename senslab package into iotlab.
don't package xml-builder anymore.
fix debian/ubuntu packaging.