0. Created Yang, Features, and basic code structure
1. Refactored endpoint translation code
2. Added checks for if neutron "tap" arrives before EP/PT registration
3. Fixed various NPEs

Change-Id: I0843a88d47f90800892e7b39fe4cc6e3033ace32
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>