Migrate CLI and other misc scripts to Python 3

[tst-cjeffries]

Migrates all python scripts to python 3. Does not include server, or portable server.

To test:

1. Build and install opengee.
2. Run integration tests.
3. Run tutorials.
4. Test the various scripts that are still useful.

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[tst-cjeffries]

I have manually checked and confirmed that all authors have signed the CLA.

[google-cla[bot]]

:frowning_face: Sorry, but only Googlers may change the label cla: yes.

[google-cla[bot]]

:frowning_face: Sorry, but only Googlers may change the label cla: yes.

[google-cla[bot]]

:frowning_face: Sorry, but only Googlers may change the label cla: yes.

[google-cla[bot]]

:frowning_face: Sorry, but only Googlers may change the label cla: yes.

[google-cla[bot]]

:frowning_face: Sorry, but only Googlers may change the label cla: yes.

[google-cla[bot]]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

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