logging: choose the log facility from the command line, or log to stderr
s/force_relay/force-relay/
Merge branch 'log-facility-switch' of github.com:camilleoudot/rtpengine into camilleoudot-log-facility-switch
Merge branch 'camilleoudot-log-facility-switch'
paving the way to multi-interface support
incorporate new local-interface infrastructure into appropriate places
receive local address from kernel and use it for outgoing packets
support specifying interfaces to use in control protocols