No need to restart DB / OVS on changing dscp value.

No need to restart DB / OVS on changing dscp value.

With this change there is no need to restart the DB or OVS on configuring a
different value for the manager or controller connection respectively. On
detecting a change in the dscp value on the socket, the previous socket is
closed and a new socket is created and connection is established with the new
configured dscp value.

Signed-off-by: Mehak Mahajan <mmahajan@nicira.com>