Adding changes for configuring an ip address on a vif from the front-end.
The message is received by the cp-fea and forwarded to the appropriate fea-stitch slot.
The fea-stitch on receiving the message, actually configures the ip address on the interface.
Add changes for configuring an ip address on a vif from the cli.
The ip address add message comes to the cp-fea which forwards it to the
appropriate lc-fea which actually configures the ip address on the interface.