FIX wrong package declaration, Dockerfile & gradle

uc2-workload-generator/Dockerfile

 FROM openjdk:11-slim
 
-ADD build/distributions/exp-bigdata19-bridge.tar /
+ADD build/distributions/uc2-workload-generator.tar /
 
-CMD export JAVA_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=$LOG_LEVEL \
-    && /exp-bigdata19-bridge/bin/exp-bigdata19-bridge
\ No newline at end of file
+CMD  JAVA_OPTS="$JAVA_OPTS -Dorg.slf4j.simpleLogger.defaultLogLevel=$LOG_LEVEL" \
+     /uc2-workload-generator/bin/uc2-workload-generator
\ No newline at end of file

uc2-workload-generator/build.gradle

@@ -21,7 +21,7 @@ dependencies {
     testCompile 'junit:junit:4.12'
 }
 
-mainClassName = "titan.ccp.kiekerbridge.expbigdata19.ExperimentorBigData"
+mainClassName = "uc2.workloadGenerator.LoadGenerator"
 
 eclipse {
     classpath {