Adding tunnel ipv4 src/dst openflow augmentations

Adding tunnel ipv4 src/dst openflow augmentations

Augments the low-level openflowjava models and
OF13 implementation to support flow based tunnels
rather then port based tunnels only which is ovsdb
specific thus making a more generic TEP implementation.

I used the v4 parent serializer
AbstractOxmIpv4AddressSerializer since its pretty
class agnostic except for the v4 OpenflowBasic
match but it that is abstracted from the DP and
I don't see any glaring issues uses it. If you
guys would prefer an NXM1Class/NXM0Class specific
ipv4 super just say the word. I have both
implementations local with the same result in the DP.

Output of tests and ovs integration is posted here:
https://gist.github.com/22f0749bba00df1a3cf6

Change-Id: I0f3ebed560bba0137553944fe342704456b4658e
Signed-off-by: Brent Salisbury <brent.salisbury@gmail.com>