Fixes Python test failure on Configuration API quickstart

[paulyuk]

Test failures can happen running tests on 1.13 -> 1.14 because test relied on implicit ToString instead of inspecting .value off of the configuration item. Also ensure print consistently handles string interpolation.

Thank you @berndverst for educating me here.

Issue reference

#1050

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

@msfussell Python tests pass, ready to merge.

[paulyuk]

Merging. The JS and Tutorials failures are unrelated and have separate issues tracking.

[paulyuk]

@hhunter-ms docs-needed pls