Setting tag sfa-2.0-1

Setting tag sfa-2.0-1
cleaned up all references to SFA_*_TYPE in config
enable cache at the aggregate by default
registry now uses the driver in a sensible way (see managers/driver.py)
slice manager supports sfav1/pgv2 neighbours
get_key renamed into get_key_from_incoming_ip
new sfa.storage module for record/table and all db-related stuff
db schema in sfa.storage.sfa.sql
init.d and cron.d move one step up
cleaned up rspec/ directory
add deps to pyopenssl and myplc-config
start support for new API (return value)
plc.remoteshell removed, use plshell instead
plshell uses a 'capability' auth method whenever possible
various tweaks in rspec elements
made dependency on sfatables softer