Add PHP 7.3 runtime

[akrabat]

Add support for the new PHP 7.3 runtime.

Related issue and scope

• Relatedissue to propose and discuss this change (Add PHP 7.3 runtime support to default deployments #4174)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[rabbah]

Add to swagger here: https://github.com/apache/incubator-openwhisk/blob/master/core/controller/src/main/resources/apiv1swagger.json

[akrabat]

Added to swagger. Thanks @rabbah.

[csantanapr]

LGTM

[csantanapr]

Suggested change

	The specific versions of these packages depends on the PHP runtime in use and is listed in the
	The specific versions of these packages depends on the PHP runtime in use and is listed in the

remove trailing space

[codecov-io]

Codecov Report

Merging #4182 into master will decrease coverage by 4.85%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4182      +/-   ##
==========================================
- Coverage   86.03%   81.18%   -4.86%     
==========================================
  Files         152      152              
  Lines        7292     7292              
  Branches      472      472              
==========================================
- Hits         6274     5920     -354     
- Misses       1018     1372     +354

Impacted Files	Coverage Δ
...core/database/cosmosdb/RxObservableImplicits.scala	0% <0%> (-100%)	⬇️
...core/database/cosmosdb/CosmosDBArtifactStore.scala	0% <0%> (-95.54%)	⬇️
...sk/core/database/cosmosdb/CosmosDBViewMapper.scala	0% <0%> (-92.6%)	⬇️
...whisk/core/database/cosmosdb/CosmosDBSupport.scala	0% <0%> (-83.34%)	⬇️
...abase/cosmosdb/CosmosDBArtifactStoreProvider.scala	0% <0%> (-62.5%)	⬇️
...in/scala/org/apache/openwhisk/common/Counter.scala	40% <0%> (-20%)	⬇️
...penwhisk/core/database/cosmosdb/CosmosDBUtil.scala	92% <0%> (-4%)	⬇️
...rg/apache/openwhisk/common/ForcibleSemaphore.scala	92.3% <0%> (-3.85%)	⬇️
...whisk/connector/kafka/KafkaConsumerConnector.scala	61.19% <0%> (+1.49%)	⬆️

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