Add crypto extern to behavioral-model#834

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hesingh wants to merge 23 commits intop4lang:mainfrom

Commits on Dec 12, 2019

Add crypto extern
hesingh
committed

Commits on Dec 18, 2019

Commits on Dec 19, 2019

Delete basic.p4 since it's pointed to in the repo
hesingh
committed

Commits on Dec 24, 2019

Sync extern from macsec parent
hesingh
committed

Commits on Dec 28, 2019

Commits on Dec 29, 2019

Add Makefile to extern code
hesingh
committed

Commits on Jan 7, 2020