docker: Do not disable telemetry if logging.config is present.

[winder]

Summary

The docker image proactively disables telemetry if TELEMETRY_NAME is not set. Presumably this was to allow turning telemetry on and off for an existing container. This has a side effect of disabling telemetry enabled by a logging.config override.

We have two options:

1. this is desirable behavior even when providing logging.config. No change is necessary.
2. (this PR) If logging.config is provided and no TELEMETRY_NAME is provided, skip disabling telemetry.

Test Plan

Manually tested the bash script and ran it through shellcheck.

[codecov]

Codecov Report

Merging #5769 (abd3981) into master (79fb8fe) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5769      +/-   ##
==========================================
- Coverage   55.50%   55.44%   -0.06%     
==========================================
  Files         473      473              
  Lines       66684    66684              
==========================================
- Hits        37010    36975      -35     
- Misses      27156    27187      +31     
- Partials     2518     2522       +4     

see 9 files with indirect coverage changes

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[gmalouf]

I think your suggestion is the right approach - we may need to communicate this a bit though hard to tell to whom..