Add the license and notice for ConcurrentMapBackedCache.scala

[houshengbo]

The source code file called ConcurrentMapBackedCache.scala uses the source
code of Spray.

Closes: apache/openwhisk-release#152

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 #3703 into master will increase coverage by 0.96%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master    #3703      +/-   ##
==========================================
+ Coverage   74.06%   75.02%   +0.96%     
==========================================
  Files         126      127       +1     
  Lines        6030     6030              
  Branches      388      388              
==========================================
+ Hits         4466     4524      +58     
+ Misses       1564     1506      -58

Impacted Files	Coverage Δ
...re/database/MultipleReadersSingleWriterCache.scala	95.83% <ø> (+1%)	⬆️
...whisk/core/database/ConcurrentMapBackedCache.scala	90% <90%> (ø)
...cala/src/main/scala/whisk/http/ErrorResponse.scala	89.77% <0%> (+1.13%)	⬆️
...on/scala/src/main/scala/whisk/common/Logging.scala	87.35% <0%> (+1.14%)	⬆️
...ain/scala/whisk/core/entity/ActivationResult.scala	92.3% <0%> (+1.53%)	⬆️
...rc/main/scala/whisk/common/ForcableSemaphore.scala	88.46% <0%> (+3.84%)	⬆️
...in/scala/whisk/utils/ExecutionContextFactory.scala	100% <0%> (+7.69%)	⬆️
...rc/main/scala/whisk/core/entity/ExecManifest.scala	96.1% <0%> (+15.58%)	⬆️
...whisk/connector/kafka/KafkaConsumerConnector.scala	58.33% <0%> (+22.91%)	⬆️
... and 2 more

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[mrutkows]

@houshengbo thanks for running a PG as asked; you may want to include the number in the comments.

[houshengbo]

Playground4/1758/ passed.