address telemetry message truncation bug - bad unicode error

[feng-j678]

[x] add code to fix telemetry message truncation bug - bad unicode error [x] add unit tests prior code change post code change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (83961b0) 90.45% compared to head (029ed5d) 90.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #228 +/- ## ======================================= Coverage 90.45% 90.46% ======================================= Files 90 90 Lines 15011 15024 +13 ======================================= + Hits 13578 13591 +13 Misses 1433 1433 ``` | [Flag](https://app.codecov.io/gh/Azure/LinuxPatchExtension/pull/228/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Azure) | Coverage Δ | | |---|---|---| | [python27](https://app.codecov.io/gh/Azure/LinuxPatchExtension/pull/228/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Azure) | `90.46% <100.00%> (+<0.01%)` | :arrow_up: | | [python39](https://app.codecov.io/gh/Azure/LinuxPatchExtension/pull/228/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Azure) | `90.46% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Azure#carryforward-flags-in-the-pull-request-comment) to find out more.

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