remove swift:4.2

[dgrove-oss]

No description provided.

[codecov-commenter]

Codecov Report

Merging #5160 (231ffba) into master (cf36299) will increase coverage by 29.24%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5160       +/-   ##
===========================================
+ Coverage   45.68%   74.93%   +29.24%     
===========================================
  Files         234      234               
  Lines       13382    13382               
  Branches      541      541               
===========================================
+ Hits         6114    10028     +3914     
+ Misses       7268     3354     -3914     

Impacted Files	Coverage Δ
...whisk/connector/kafka/KafkaConsumerConnector.scala	59.15% <0.00%> (-28.17%)	⬇️
...whisk/connector/kafka/KafkaProducerConnector.scala	60.00% <0.00%> (-27.50%)	⬇️
...pache/openwhisk/core/invoker/InvokerReactive.scala	58.62% <0.00%> (-20.69%)	⬇️
.../scala/org/apache/openwhisk/utils/Exceptions.scala	20.00% <0.00%> (-20.00%)	⬇️
...pache/openwhisk/core/containerpool/Container.scala	89.65% <0.00%> (-1.15%)	⬇️
...e/openwhisk/core/containerpool/ContainerPool.scala	96.47% <0.00%> (+1.17%)	⬆️
.../org/apache/openwhisk/core/entity/EntityPath.scala	100.00% <0.00%> (+1.88%)	⬆️
...la/org/apache/openwhisk/common/TransactionId.scala	94.38% <0.00%> (+2.24%)	⬆️
.../org/apache/openwhisk/http/PoolingRestClient.scala	90.90% <0.00%> (+3.03%)	⬆️
...sk/core/containerpool/docker/DockerContainer.scala	95.60% <0.00%> (+3.29%)	⬆️
... and 127 more

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