Jenkins job: docker creds in build-specific directory

[dgrove-oss]

Accommodate changes in ASF Jenkins configuration for credentials

[codecov-commenter]

Codecov Report

Merging #5167 (5cc1259) into master (285f9d4) will increase coverage by 34.89%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5167       +/-   ##
===========================================
+ Coverage   45.24%   80.14%   +34.89%     
===========================================
  Files         234      234               
  Lines       13389    13389               
  Branches      551      551               
===========================================
+ Hits         6058    10730     +4672     
+ Misses       7331     2659     -4672     

Impacted Files	Coverage Δ
...whisk/connector/kafka/KafkaConsumerConnector.scala	59.15% <0.00%> (-22.54%)	⬇️
...whisk/connector/kafka/KafkaProducerConnector.scala	80.00% <0.00%> (-7.50%)	⬇️
...pache/openwhisk/core/containerpool/Container.scala	89.65% <0.00%> (-1.15%)	⬇️
...ntainerpool/v2/FunctionPullingContainerProxy.scala	78.12% <0.00%> (+0.34%)	⬆️
.../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%)	⬆️
...tainerpool/docker/DockerClientWithFileAccess.scala	96.00% <0.00%> (+4.00%)	⬆️
...a/org/apache/openwhisk/core/entity/TimeLimit.scala	95.65% <0.00%> (+4.34%)	⬆️
... and 137 more

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