Move the OUI upgrade and field to master

[evanmcc]

This also gets rid of neighbors, and should help tame some of the apparent drift we've been seeing.

NB: this is not something that we can roll back without a code change. Once it's out there, we've committed to it.

[vihu]

Should we add a getter for oui while here? In gateway_ledger_v2

[codecov]

Codecov Report

Merging #397 into master will decrease coverage by 6.61%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master     #397      +/-   ##
==========================================
- Coverage   68.53%   61.92%   -6.62%     
==========================================
  Files          72       72              
  Lines        7366     7382      +16     
==========================================
- Hits         5048     4571     -477     
- Misses       2318     2811     +493

Impacted Files	Coverage Δ
src/blockchain.erl	65.71% <0%> (-1%)	⬇️
src/ledger/v1/blockchain_ledger_gateway_v2.erl	64.49% <50%> (-4.45%)	⬇️
src/poc/blockchain_poc_target_v3.erl	0% <0%> (-93.75%)	⬇️
src/poc/blockchain_poc_path_v3.erl	0% <0%> (-89.1%)	⬇️
src/poc/blockchain_poc_target_v2.erl	0% <0%> (-89.02%)	⬇️
src/poc/blockchain_poc_path_v4.erl	0% <0%> (-88.2%)	⬇️
src/poc/blockchain_poc_path_v2.erl	0% <0%> (-87.97%)	⬇️
src/blockchain_utils.erl	76% <0%> (-10.67%)	⬇️
src/blockchain_score_cache.erl	75.6% <0%> (-2.44%)	⬇️
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6f49af3...c826f01. Read the comment docs.