Debianize 0.8.2.1 tag
This renames the kafka-client package to kafka-cli,
in order to disambiguate the package name from the
kafka-clients.jar shipped with kafka-common.
kafka-examples .jars are no longer shipped as part of the kafka-common
package, and kafka-perf no longer exists as its own jar.
Any ext/ jars that are shipped along with the packages have been
intentially named with their version numbers, so as to avoid
potential naming conflicts with packages that might come from
Debian or Ubuntu. This won't avoid all conflicts, but it will
likely avoid most.