2.12 release: branch voltha-2.12 created from tag v2.12.0

1. 89c812c Build baseline for release by Joey Armstrong · 9 months ago v2.11.11
2. e8c091f VOL-4925 - Build and release components. by Joey Armstrong · 1 year, 8 months ago v2.7.3
3. f333355 [VOL-4442] grpc streaming connection monitoring by khenaidoo · 2 years, 10 months ago