Support setting action concurrency in manifest #176

[alexkli]

Description

Fixes #176

To discuss: the name choice of concurrency. The openwhisk manifest spec does not include it yet (note that concurrentActivations is a different limit). I simply used the same name as used in the OpenWhisk API & wsk.

How Has This Been Tested?

• unit test
• deployed example action in production with concurrency set in manifest.yml and tested that wsk action get <action> shows the concurrency limit

manifest.yml:

packages:
  __APP_PACKAGE__:
    license: Apache-2.0
    actions:
      worker:
        function: actions/worker/index.js
        web: 'yes'
        runtime: 'nodejs:10'
        limits:
          concurrency: 42
        annotations:
          require-adobe-auth: true

Result snippet of wsk action get $package-0.0.1/__secured_worker:

    "limits": {
        "timeout": 60000,
        "memory": 256,
        "logs": 10,
        "concurrency": 42
    },

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
  • Note: there is no section in the Firefly documentation for supported manifest files yet
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #177 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #177   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        57           
  Lines         2022      2024    +2     
  Branches       408       409    +1     
=========================================
+ Hits          2022      2024    +2     

Impacted Files	Coverage Δ
src/runtime-helpers.js	100.00% <100.00%> (ø)

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