Keymaker

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- Remove unused dependency; bump others to match Ubuntu 18.04

- keymaker upload_key: add friendlier errors

- Fix crontab file for group syncing

- Print error message for sshd config and reload failures (52)

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- Look up keymaker executables in path using shutil.which and fallback
(56)

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- Provide more feedback when managing keys

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- Avoid trimming username if the suffix length is zero (47)

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- Fix logic error in keymaker sync_groups

- Allow username suffix to be set in keymaker configure

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Fixup for get_uid with user suffix