build: display local state dir configuration

build: display local state dir configuration

Configure is displaying the run state directory but not the local state
directory.

> FRRouting configuration
> ------------------------------
> state file directory    : /usr/var/run/frr
> config file directory   : /etc/frr

Display the local state directory as well.

> local state file dir    : /usr/var/lib/frr
> run state file dir      : /usr/var/run/frr
> config file directory   : /etc/frr

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>