support false values and missing fields in configs

[goddenrich]

updated the python-base to include support for false values and missing fields in config files

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[goddenrich]

/assign @yliaog

[micw523]

/lgtm

[micw523]

ref kubernetes-client/python-base#163

[yliaog]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: goddenrich, yliaog

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