BYOC: fix req timeout removing capability v2

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What does this pull request do? Explain your changes. (required)

Fix # 2 to fix kicking an external capability when the request timed out.

Request timeouts are not always going to be fatal, plan to monitor and adjust as build out BYOC.

Specific updates (required)

How did you test each of these updates (required)

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 31.85110%. Comparing base (f46377d) to head (c48cdb4).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
server/job_rpc.go	0.00000%	3 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3651         +/-   ##
===================================================
+ Coverage   31.76413%   31.85110%   +0.08697%     
===================================================
  Files            156         156                 
  Lines          47349       47361         +12     
===================================================
+ Hits           15040       15085         +45     
+ Misses         31428       31387         -41     
- Partials         881         889          +8     

Files with missing lines	Coverage Δ
server/job_rpc.go	23.54988% <0.00000%> (+6.13812%)	⬆️

... and 3 files with indirect coverage changes

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Files with missing lines	Coverage Δ
server/job_rpc.go	23.54988% <0.00000%> (+6.13812%)	⬆️

... and 3 files with indirect coverage changes

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[pschroedl]

I might consider keeping the original err != context.cancelled, but LGTM.