Update logback

[mhenke1]

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.

[mhenke1]

Reference:
http://logback.qos.ch/news.html

[codecov-commenter]

Codecov Report

Merging #101 (8dc1b74) into master (f0f4525) will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   78.33%   78.65%   +0.32%     
==========================================
  Files         194      194              
  Lines        9267     9267              
  Branches      542      542              
==========================================
+ Hits         7259     7289      +30     
+ Misses       2008     1978      -30     

Impacted Files	Coverage Δ
...org/apache/openwhisk/core/controller/Actions.scala	94.02% <0.00%> (+0.99%)	⬆️
...isk/core/controller/actions/PrimitiveActions.scala	88.88% <0.00%> (+1.30%)	⬆️
.../org/apache/openwhisk/core/connector/Message.scala	67.96% <0.00%> (+2.34%)	⬆️
...e/loadBalancer/ShardingContainerPoolBalancer.scala	92.06% <0.00%> (+2.64%)	⬆️
.../scala/org/apache/openwhisk/utils/Exceptions.scala	40.00% <0.00%> (+20.00%)	⬆️
...whisk/connector/kafka/KafkaConsumerConnector.scala	81.69% <0.00%> (+23.94%)	⬆️

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