Setting tag sfa-3.1-5

Setting tag sfa-3.1-5
Slice Manager is down by default
sfi renew -l/--as-long-as-possible and e.g. sfi renew <> +2[d|w|m]
also renew tries to find a max date for renewal instead of bailing out
sfaclientlib file names scheme keeps track of user as well as object for credentials
none fields get removed before sending over xmlrpc - partially for now
cleanup on time formats and - hopefully timezones
cleanup on speaking_for
Allocate passes actual_caller_hrn as part of options to driver
iotlab driver and leases
new modules abac_credential, credential_factory and speaksfor_util