Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This is another step in a general cleanup of the state machine.  To
help me knowning what is audited and what is not, I rename the "common
functions" to fsm-lib. This is the management of announce.

- master and slave functions were the same, so they are unified now

- hooks->handle_annunce returns int (it may fail)
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This, btw, made me note that we have a problem with pdelay and
multiple vlans.

Multiple vlan is a hack anyways....
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

To help me knowning what is audited and what is not, I will rename
the "common functions" to fsm-lib. Let's now open this pp_lib_*
name space with some more timeout cleanup.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>