[GOBBLIN-1671] : Fix gobblin.sh script to add external jars as colon separated to HADOOP_CLASSPATH (#3531)
[GOBBLIN-1671] : Fix gobblin.sh script to add external jars as colon separated to HADOOP_CLASSPATH (#3531)

When using `mapreduce` mode in gobblin.sh, the additional jars passed to
gobblin.sh through --jars are comma separated. They are incorrectly
added to HADOOP_CLASSPATH that takes colon (:) separated jars.
arjun4084346/gobblin,arjun4084346/gobblin,jack-moseley/gobblin,jack-moseley/gobblin,arjun4084346/gobblin,jack-moseley/gobblin,jack-moseley/gobblin,arjun4084346/gobblin,arjun4084346/gobblin,jack-moseley/gobblin