[WIP] Use django/django in build script

[FirePing32]

fixes: googleapis/google-cloud-python#15951

WIP: A new adaption of #527

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[FirePing32]

@googlebot I signed it!

[FirePing32]

@c24t Although I am still working on this, shouldn't we add a commitment.config.js to validate commits ?

[c24t]

shouldn't we add a commitment.config.js to validate commits ?

There's a googleapis checker for this, AFAIK this is configured the same way for all repos in the org. You can see the check in action on this PR above.

[c24t]

FYI you can open PRs as drafts if they're WIP and not ready for review: https://github.blog/2019-02-14-introducing-draft-pull-requests/.

[c24t]

Closing as inactive. To fix googleapis/google-cloud-python#15951 we need to patch django in tests (or host our own patched version of django), not just s/timgraham/django/.