dhcp: add dhcp classless static route support

dhclient needs to be configured to request classess static
routes (option code 121) from dhcp server. And dhclient-script will call
dhclient-exit-hooks which will parse and add the static routes
received from dhcp server into the routing table.

The support are built into both controller image and usb guest image,
but only guest image makes use of it to add static route for instance to
access metadata.

Signed-off-by: Andy Ning <andy.ning@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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