Reference #883: env timeout open k8s logstream

[aeter]

References #883

Adds env variable to configure open logstream timeout.

Please note: when writing this PR: not sure where/how to document the env variable (other than in the code), so users can find it.

Testing:

$ PATH="${PWD}:${PATH}" go test ./pkg/workceptor/kubernetes_test.go
ok      command-line-arguments  0.014s
$ PATH="${PWD}:${PATH}" go test ./pkg/workceptor/kubernetes_test.go -count=1 -race -timeout 5m
ok      command-line-arguments  1.053s 

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 41.48%. Comparing base (9192dc5) to head (4a81a46).
Report is 17 commits behind head on devel.

Files with missing lines	Patch %	Lines
pkg/workceptor/kubernetes.go	94.11%	1 Missing ⚠️

@@            Coverage Diff             @@
##            devel    #1154      +/-   ##
==========================================
+ Coverage   40.84%   41.48%   +0.64%     
==========================================
  Files          45       48       +3     
  Lines        9279     9875     +596     
==========================================
+ Hits         3790     4097     +307     
- Misses       5198     5487     +289     
  Partials      291      291              

Files with missing lines	Coverage Δ
pkg/workceptor/kubernetes.go	28.57% <94.11%> (+0.92%)	⬆️

... and 7 files with indirect coverage changes

Components	Coverage Δ
Go	41.00% <94.11%> (+0.15%)	⬆️
Receptorctl	49.31% <ø> (∅)

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[JoelKle]

thank you for the PR, @aeter! @AaronH88, @thom-at-redhat, @fosterseth - besides the small linting issues to fix, do we need anything else for this PR?

[AaronH88]

Sorry for the delay in replying, This PR looks really good. I just have a request for a bit more defensive programming and it should be good to merge 😄

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[aeter]

Thanks! Updated per review, added more unit tests (for "-1", "0") at kubernetes_test.go, rebased with latest devel.

[AaronH88]

lgtm

Thanks so much for the PR