Implement altering Autofield#189

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n2ygk wants to merge 3 commits intomichiya:azure-2.1from

n2ygk:autofield

Commits on Nov 19, 2018

forward port https://github.com/michiya/django-pyodbc-azure/pull/184 to azure-2.1
n2ygk
committed

Commits on Nov 28, 2018