BYOC: add simple include/exclude ability of Orchestrators in request

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

Adds ability to send parameter in request to Gateway to include or exclude Orchestrators based on serviceAddr.

Add to parameters field of request as a json string (e.g. "parameters": JSON.stringify(parameters)):

{"orchestrators": {
      "exclude": [
              "https://orch1.url",
              "https://orch2.url",
              "https://orch3.url"
      ],
      "include": [
              "https://orch4.url",
              "https://orch5.url",
              "https://orch6.url
      ]
}

Specific updates (required)

• add exclude/include parameters to getJobOrchestrators to enable client simple ability to direct request if preferred

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 52.94118% with 8 lines in your changes missing coverage. Please review.

Project coverage is 31.86444%. Comparing base (f46377d) to head (48bcb69).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
server/job_rpc.go	52.94118%	8 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3634         +/-   ##
===================================================
+ Coverage   31.76413%   31.86444%   +0.10031%     
===================================================
  Files            156         156                 
  Lines          47349       47360         +11     
===================================================
+ Hits           15040       15091         +51     
+ Misses         31428       31381         -47     
- Partials         881         888          +7     

Files with missing lines	Coverage Δ
server/job_rpc.go	23.57724% <52.94118%> (+6.16548%)	⬆️

... and 2 files with indirect coverage changes

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Files with missing lines	Coverage Δ
server/job_rpc.go	23.57724% <52.94118%> (+6.16548%)	⬆️

... and 2 files with indirect coverage changes

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[pschroedl]

LGTM. 👍