netdev: Make naming more consistent

netdev-dummy and netdev-vport use the function name netdev_poll_notify()
for the same purpose as netdev-linux/bsd's netdev_*_changed(). This patch
changes the former two to be more consistent with the linux/bsd naming
scheme.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
cfm: Count flaps when logging is disabled

Previously, the flap count logic for CFM was dependent on the state of
the logging facility. This patch ensures flaps are always counted when
there is a transition between non-fault and fault (and vice versa).

Found by inspection.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
ofproto: Check ofproto_port_query_by_name() return value when adding port.

Otherwise, if the port add succeeds but the query that looks up the port
number fails, then ofproto_port_add() would return zero as the OpenFlow
port number and ignore the error.

Reported-by: Guolin Yang <gyang@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>