Build fails for GO version 1.12

[joseph-v]

Issue/Feature Description:
If go version is 1.12, the build fails on proto file compile. This is can be fixed by exporting GO111MODULE=on from make file

Why this issue to fixed / feature is needed(give scenarios or use cases):
We need to support GO version 1.12

How to reproduce, in case of a bug:
run command 'make all' in a machine with GO version 1.12 installed

Other Notes / Environment Information: (Please give the env information, log link or any useful information for this issue)