sfa-3.1-1

Setting tag sfa-3.1-1
-- core
clean up rspecs.
GENIv3 rspecs enhirits everything from pgv2.
fix dbsession mgt by attributing each incoming API call has its own dbsession.
update all drivers and v2_to_v3_adapter according to dbsession fix.
fix DB migration.
-- client
fix sfi.py myslice.
sfi.py new option "my_pkcs12".
sfi.py defaulr rspec version is GENIv3
sfi.py trusted target either Registry interface or Slice interface.
-- PlanetLab
rebase all pl driver operations around the objects HRNs.
ignore objects (Site/Slice/Person/Node) coming from MyPLC peering.
importer ignores sites with tag sfa_created='True'.
-- IoTLab
In progress writing of native AM API v3 compliant driver.