Add disable auto register schemas

[dpfeif]

This is meant to fix #659

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[dpfeif]

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[ghost]

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[dpfeif]

I'm unable to see the link between the proposed changes and the AppVeyor build failing: https://ci.appveyor.com/project/ConfluentClientEngineering/confluent-kafka-python/builds/28935232

[nysthee]

Seems the Windows builds are failing on master as well.

[edenhill]

Looking into the windows build failures, seems to be caused by cibuildwheel upgrade

[nysthee]

@edenhill can we assist on the failing build? We are eager to have this PR build successfully and reviewed.

[edenhill]

Rebasing this PR on latest master should sort out the build issues.

[rnpridgeon]

LGTM, I'll get it in after finalizing the 1.3.0 release.

[nysthee]

Hi @rnpridgeon when is this meant to be merged?