Add option "fast hello"

ip ospf dead-interval minimal hello-multiplier <2-20>

dead-interval is set to 1 second
hello-multiplier specifies how many "hellos" to send per second

Signed-off-by: pkilla <pkilla@yandex.ru>
remove bold
Add option "disable interface"
increase version number

Signed-off-by: pkilla <pkilla@yandex.ru>