netutils/dhcpd: move catch up with dhcpd stop
netutils/dhcpd: move catch up with dhcpd stop

This commit is to move catch up with dhcpd stop signal.
When it has connected clients, it couldn't reach the catch up routine.
So, it's moved up to handle stop signal properly.

Change-Id: Ic095f034646d9c19240b640cbb0acc8a8851a2c5
Signed-off-by: Changsoon Kim <c1120524009612ae00648f6848418e342ca4bc0a@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT