sfa-2.0-2

Setting tag sfa-2.0-2
various fixes in rspecs for sfav1&slice tags
uses 'geni_rspec_version' and not just 'rspec_version'
example flavour for the max testbed
embryo for an sfa client library
topology.py moved into plc
sql: table is named records; record_types are enforced
sql: table creation cleaned up