Check to see if the user can see the topic before creating it,

[mcdan]

this allows lower privlage users to be set for the controller
and invoker.

Description

Related issue and scope

• I opened an issue to propose and discuss this change (#????)

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.

[codecov-io]

Codecov Report

Merging #11 into master will increase coverage by 0.07%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   85.12%   85.19%   +0.07%     
==========================================
  Files         197      197              
  Lines        8839     8843       +4     
  Branches      619      606      -13     
==========================================
+ Hits         7524     7534      +10     
+ Misses       1315     1309       -6

Impacted Files	Coverage Δ
...whisk/connector/kafka/KafkaMessagingProvider.scala	70.73% <42.85%> (+0.46%)	⬆️
...pache/openwhisk/core/invoker/InvokerReactive.scala	79.82% <0%> (-0.88%)	⬇️
...e/openwhisk/core/containerpool/ContainerPool.scala	96.17% <0%> (-0.64%)	⬇️
...che/openwhisk/core/database/CouchDbRestStore.scala	73.23% <0%> (-0.51%)	⬇️
.../org/apache/openwhisk/core/connector/Message.scala	77.96% <0%> (ø)	⬆️
...core/database/cosmosdb/CosmosDBArtifactStore.scala	96.22% <0%> (+0.37%)	⬆️
...rg/apache/openwhisk/common/ForcibleSemaphore.scala	88.46% <0%> (+3.84%)	⬆️
...core/database/cosmosdb/RetryMetricsCollector.scala	85.71% <0%> (+4.76%)	⬆️
...enwhisk/connector/kafka/KamonMetricsReporter.scala	100% <0%> (+14.28%)	⬆️

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