Remove dependency to cz.alenkacz.gradle.scalafmt

[steffenrost]

Fix Scala build errors because of broken dependency of cz.alenkacz.gradle.scalafmt by excluding scalafmt plugin.

Description

+ ./gradlew :bluemix:tests:testHealthWithRouter -DtestResultsDirName=test-results-ys0 -Dtestthreads=2
 Downloading https://services.gradle.org/distributions/gradle-5.5.1-all.zip
 ..................................................................................................................................
 Unzipping /home/jenkins/.gradle/wrapper/dists/gradle-5.5.1-all/8yl0syll3fr5m1v472nzznadi/gradle-5.5.1-all.zip to /home/jenkins/.gradle/wrapper/dists/gradle-5.5.1-all/8yl0syll3fr5m1v472nzznadi
 Set executable permissions for: /home/jenkins/.gradle/wrapper/dists/gradle-5.5.1-all/8yl0syll3fr5m1v472nzznadi/gradle-5.5.1/bin/gradle
 
 Welcome to Gradle 5.5.1!
 
 Here are the highlights of this release:
  - Kickstart Gradle plugin development with gradle init
  - Distribute organization-wide Gradle properties in custom Gradle distributions
  - Transform dependency artifacts on resolution
 
 For more details see https://docs.gradle.org/5.5.1/release-notes.html
 
 Starting a Gradle Daemon (subsequent builds will be faster)
 
 FAILURE: Build failed with an exception.
 
 * What went wrong:
 A problem occurred configuring root project 'bluewhisk'.
 > Could not resolve all artifacts for configuration ':classpath'.
    > Could not find cz.alenkacz:gradle-scalafmt:1.5.0.
      Searched in the following locations:
        - https://repo.maven.apache.org/maven2/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.pom
        - https://repo.maven.apache.org/maven2/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.jar
        - https://plugins.gradle.org/m2/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.pom
      Required by:
          project :
 
 * Try:
 Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
 
 * Get more help at https://help.gradle.org/
 
 BUILD FAILED in 9s

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 :).

[groezing]

all OK