[release notes] add new kudu tool features and metrics improvements
[release notes] add new kudu tool features and metrics improvements

Change-Id: Ic9514999a913c52fdfc9ed3cf6a85da50b190c68
Reviewed-on: http://gerrit.cloudera.org:8080/7865
Reviewed-by: Adar Dembo <866ca730bfc7f544e3ebce604ceeba4879f23df0@cloudera.com>
Reviewed-by: Will Berkeley <c74686ab413a71926fc1bc9d16ebfa30e619336a@gmail.com>
Tested-by: Dan Burkert <4ef91e292a55314d2653d35ff669a6bd939ce515@apache.org>

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