remove other chroot attribute, since it isn't used anywhere
first pass at installing configured special depencies for migration tool

the migration tool requires jars of ZK client and kafka 0.7 in addition to the default CP. this adds a few configuration variables to specify the remote source of those jars, and then will fetch them and call the migration tool using the given jars.
create consumer properties file targeted at 0.7 consumer, with non-default file name
broker.list->metadata.broker.list in producer conf template