Setting tag sfa-2.1-15

Setting tag sfa-2.1-15
first stab at a driver for the NITOS/OMF testbed (sep. pkg)
deeper cleanup of the data-dependencies between SFA and the testbed
in particular, sfi create issues Resolve(details=False)
for that purpose, Resolve exposes reg-* keys for SFA builtins
which in turn allows sfi list to show PIs, slice members and keys
NOTE: sfa-config-tty is known to be broken w/ less frequently used func's
Shows stacktrace when startup fails (DB conn, wrong flavour, etc..)